a can do a work in 9 days . b can do the same work in 18 days . if both a & b are working together in how many days they will finish the work ?
"a rate = 1 / 9 b rate = 1 / 18 ( a + b ) rate = ( 1 / 9 ) + ( 1 / 18 ) = 1 / 6 a & b finish the work in 6 days correct option is e"
divide(multiply(9, 18), add(9, 18))