man 1 does a work in 10 days and man 2 does the same work in 15 days . in how many days they together will do the same work ?
man 1 day work = 1 / 10 man 2 day work = 1 / 15 both work = 1 / 10 + 1 / 15 = = = > 3 + 2 / 30 = = > 1 / 6 answer c
divide(const_1, add(divide(const_1, 10), divide(const_1, 15)))