x does a work in 10 days . y does the same work in 15 days . in how many days they together will do the same work ?
"x ' s 1 day ' s work = 1 / 10 y ' s 1 day ' s work = 1 / 15 ( x + y ) ' s 1 day ' s work = ( 1 / 10 + 1 / 15 ) = 1 / 6 both together will finish the work in 6 days . correct option is d"
inverse(add(divide(const_1, 10), divide(const_1, 15)))