a can do a work in 4 days . b can do the same work in 12 days . if both a & b are working together in how many days they will finish the work ?
a rate = 1 / 4 b rate = 1 / 16 ( a + b ) rate = ( 1 / 4 ) + ( 1 / 12 ) = 1 / 3 a & b finish the work in 3 days correct option is a
divide(multiply(4, 12), add(4, 12))