Question: It's a Jungle is an EP by a band that had how many "Billboard" Top 40 hits between 1969 and 1975?
Context: Three Dog Night is an American rock band.  They formed in 1967 with a line-up consisting of vocalists Danny Hutton, Cory Wells, and Chuck Negron.  This lineup was soon augmented by Jimmy Greenspoon (keyboards), Joe Schermie (bass), Michael Allsup (guitar), and Floyd Sneed (drums).  The band registered 21 "Billboard" Top 40 hits (with three hitting number one) between 1969 and 1975.  It helped introduce mainstream audiences to the work of many songwriters, including Paul Williams ("An Old Fashioned Love Song"), Hoyt Axton ("Joy to the World"), Laura Nyro ("Eli's Comin'"), Harry Nilsson ("One"), Randy Newman ("Mama Told Me Not to Come"), and Leo Sayer ("The Show Must Go On"). American entertainer Cher has released seventy-nine official singles, fifteen promotional singles and appeared in eleven other songs.  On the "Billboard" Hot 100, she has achieved: 4 number 1 singles, 12 Top 10 singles, 22 Top 40 singles and a total of 33 charted singles as a solo artist, and combined with the entries she has had as part of a duo Sonny & Cher: 5 number 1 singles, 17 Top 10 singles, 32 Top 40 hits and a total of 51 singles which charted on the "Billboard" Hot 100. James Edward Ingram (born February 16, 1952) is an American singer, songwriter, record producer, and instrumentalist.  He is a two-time Grammy Award-winner and a two-time Academy Award nominee for Best Original Song.  Since beginning his career in 1973, Ingram has charted eight Top 40 hits on the US "Billboard" Hot 100 chart from the early 1980s until the early 1990s, as well as thirteen top 40 hits on the Hot R&B/Hip-Hop Songs chart.  In addition, he charted 20 hits on the Adult Contemporary chart (including two number-ones).  He had two number-one singles on the Hot 100: the first, a duet with fellow R&B artist Patti Austin, 1982's "Baby, Come to Me" topped the U.S. pop chart in 1983; "I Don't Have the Heart", which became his second number-one in 1990 was his only number-one as a solo artist.  In between these hits he also recorded the song "Somewhere Out There" with fellow recording artist Linda Ronstadt for the animated film "An American Tail".  The song and the music video both became gigantic hits.  Ingram co-wrote "The Day I Fall in Love", from the motion picture "Beethoven's 2nd" (1993), and singer Patty Smyth's "Look What Love Has Done", from the motion picture "Junior" (1994), which earned him nominations for Best Original Song from the Oscars, Golden Globe, and Grammy Awards in 1994 and 1995. The discography of American recording artist Diana Ross, the former lead singer of The Supremes, consists of 25 studio albums and 91 singles.  27 of her singles reached the "Billboard" Top 40 in the US, 12 of them the "Billboard" Top 10, and six of those reaching number-one, placing her in a tie for fifth among the top female solo performers who have reached the top spot there.  In the UK, she amassed a total of 47 Top 40 singles with 20 of them reaching the Top 10 and two of those reaching number-one.  In the U.S., 17 albums reached the "Billboard" Top 40, four of those the Top 10, and one album topping the chart.  In the UK, 26 albums reached the Top 40, eight of those the Top Ten, and one album topping the chart.  Ross had a Top 10 UK hit in every one of the last five decades, and sang lead on a Top 75 hit single at least once every year from 1964 to 1996 in the UK, a period of 33 consecutive years and a record for any performer.  As of 2016 she continues to collect gold and silver awards for UK sales of her many greatest hits compilation albums. M.P.G. is the ninth studio album by Marvin Gaye, released in 1969 for the Tamla label.  His best-selling album of the 1960s, it became Gaye's first solo album to reach the Top 40 on the Billboard Pop Albums chart, peaking at No. 33, and also became his first No. 1 album on the Soul Albums Chart.  Three Top 40 hits were released from the album.  The title matches the initials of Gaye's full name, Marvin Pentz Gay. Corey Mitchell Hart (born May 31, 1962) is a Canadian singer, best known for his hit singles "Sunglasses at Night" and "Never Surrender".  He has sold over 16 million records worldwide and scored nine US "Billboard" Top 40 hits.  In Canada Hart has amassed 30 Top 40 hits, including 11 in the Top 10, over the course of 30 years in the music industry.  Nominated for the Grammy Award for Best New Artist in 1984, Hart is an inductee of Canada's Walk of Fame and is also a multiple Juno award nominee and winner in Canada, including the Diamond Award for his best-selling album "Boy in the Box".  He has also been honoured by the American Society of Composers, Authors and Publishers (ASCAP) and the Society of Composers, Authors and Music Publishers of Canada (SOCAN). It's a Jungle is an EP by American rock band Three Dog Night, released in 1983. "Timothy" is a song written by Rupert Holmes and recorded by The Buoys in 1970, presenting the unnerving story of three men trapped in a collapsed mine, two of whom apparently resort to cannibalism against the third (the eponymous character Timothy).  The song managed to reach the U.S. "Billboard" Top 40 chart on April 17, 1971, remaining on the chart for eight weeks, peaking at #17, as listed in "The Billboard Book of Top 40 Hits" by Joel Whitburn.  On the U.S. "Cash Box" Top 100, it spent two weeks at #13.  In Canada, the song reached #9. Top 40 Tracks was a chart from "Billboard" magazine, which debuted in the issue dated December 5, 1998, when "Billboard" changed the airplay profile of the pop-heavy U.S. Hot 100 Airplay chart to incorporate more R&B, country, and rock stations to its radio panel.  To preserve the notion of the former chart, Top 40 Tracks was introduced.  The Top 40 Tracks was compiled by measuring audience impressions (based on a station's ratings and when a song is played) from Mainstream Top 40, Rhythmic Top 40, and Adult Top 40 radio stations. Sir Elton Hercules John, (born Reginald Kenneth Dwight; 25 March 1947), is an English singer, pianist, and composer.  He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date.  In his five-decade career Elton John has sold more than 300million records, making him one of the best-selling music artists in the world.  He has more than fifty Top 40 hits, including seven consecutive No. 1 US albums, 58 "Billboard" Top 40 singles, 27 Top 10, four No. 2 and nine No. 1.  For 31 consecutive years (1970–2000) he had at least one song in the "Billboard" Hot 100.  His tribute single, re-penned in dedication to the late Princess Diana, "Candle in the Wind 1997" sold over 33million copies worldwide and is the best-selling single in the history of the UK and US singles charts.  He has also composed music, produced records, and has occasionally acted in films.  John owned Watford Football Club from 1976 to 1987, and 1997 to 2002.  He is an honorary Life President of the club, and in 2014 had a stand named after him at the club's home stadium.
Answer: 21