a and b can do a work in 5 days and 10 days respectively . a starts the work and b joins him after 4 days . in how many days can they complete the remaining work ?
"work done by a in 4 days = 4 / 5 remaining work = 1 / 5 work done by both a and b in one day = 1 / 5 + 1 / 10 = 3 / 10 remaining work = 1 / 5 * 10 / 3 = 2 / 3 days . answer : b"
subtract(add(inverse(add(inverse(10), inverse(5))), 5), const_3)