if 5 machines can produce 20 units in 10 hours , how long would it take 10 machines to produce 100 units ?
"5 machines would produce 100 units in 50 hours . increasing the amount of machines by 2 would mean dividing 50 hours by 2 . 50 / 2 = 25 answer : a"
divide(100, multiply(divide(divide(10, 10), 5), 20))