in a group of 28 junior high school students , 7 take french , 10 take spanish , and 2 take both languages . the students taking both french and spanish are not counted with the 7 taking french or the 10 taking spanish . how many students are not taking either french or spanish ?
"c 9 add 7 + 10 + 2 to get 19 then subtract 21 from the total students ⇒ 28 – 19 = 9 . answer is c"
subtract(28, add(7, 10))