The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: a dishonest dealer professes to sell goods at the cost price but uses a weight of 800 grams per kg , what is his percent ?

Output: 25 %

Input: Consider Input: Problem: the malibu country club needs to drain its pool for refinishing . the hose they use to drain it can remove 60 cubic feet of water per minute . if the pool is 60 feet wide by 100 feet long by 10 feet deep and is currently at 80 % capacity , how long will it take to drain the pool ?

Output: 800

Input: Consider Input: Problem: in a group of ducks and cows , the total number of legs are 40 more than twice the number of heads . find the total number of cows .
Output: 2