C. Solve the problems involving inverse proportion. Show your solution on your answer sheet.
 
1.     Twelve painters can paint a building in 10 days. How many painters is needed to paint it in 6 days?
 
2.     Three pumps working together can empty a swimming pool in 6 hours. How long will 6 pumps take to empty the pool?
 
3.     A box of chalk will last 9 days if 4 pieces of chalk are used each day. How long will the box last if 3 pieces are used each day?
 
4.     A certain number of chairs are put in the hall. They will be arranged in 21 rows if 18 chairs are put in each row. How many rows will be formed if 4 less chairs are out in each row?
 
pa help po please need na need ko po ngayon​