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

Problem: the average of first 5 multiples of 5 is
1

Problem: 475.124 x 15.98 ÷ 8.001 + 33.33 = ?
983.578

Problem: two pipes a and b can separately fill a tank in 16 and 18 minutes respectively . a third pipe c can drain off 45 liters of water per minute . if all the pipes are opened , the tank can be filled in 18 minutes . what is the capacity of the tank ?

720 liters