a can do a piece of work in 4 days . b can do it in 15 days . with the assistance of c they completed the work in 24 days . find in how many days can c alone do it ?
"c = 1 / 2 - 1 / 24 - 1 / 15 = 0.391 days answer : a"
divide(multiply(4, 15), divide(subtract(multiply(4, 15), multiply(add(divide(multiply(4, 15), 4), divide(multiply(4, 15), 15)), 24)), 24))