a can do a piece of work in 20 days and b can do it in 30 days and c can do it 10 days . they started the work together and a leaves after 2 days and c leaves after 4 days from the beginning . how long will work lost ?
2 / 20 + x / 30 + 4 / 10 = 1 x = 300 / 20 = 15 answer : e
add(divide(subtract(const_1, add(multiply(subtract(4, 2), add(inverse(30), inverse(10))), multiply(add(inverse(10), add(inverse(20), inverse(30))), 2))), inverse(30)), 4)