Problem: two pipes a and b can separately fill a tank in 8 and 10 minutes respectively . a third pipe c can drain off 15 liters of water per minute . if all the pipes are opened , the tank can be filled in 10 minutes . what is the capacity of the tank ?
Rationale: "1 / 8 + 1 / 10 - 1 / x = 1 / 10 x = 8 8 * 15 = 120 answer : e"
annotated_formula: multiply(multiply(inverse(subtract(add(add(divide(const_1, 8), divide(const_1, 10)), divide(const_1, 15)), divide(const_1, 10))), const_3), 10)