a can do a work in 25 days and b can do it in 10 days . in how many days a and b can do the work ?
"explanation : a ' s 1 day ' s work = 1 / 25 b ' s 1 day ' s work = 1 / 10 they work together = 1 / 25 + 1 / 10 = 7 / 50 = 50 / 7 = 6 8 / 7 days answer : option c"
divide(const_1, subtract(divide(const_1, 10), divide(const_1, 25)))