1. A road maintenance team needs to build a road with a length of 2 100 meters, with an average of 240 meters per day in the first five days. The remaining tasks will take three days to complete. How many meters do you need to repair every day on average? The formula is (2 100-240× 5) ÷ 3.

Teacher Wang went to the sporting goods store and bought 36 balls, 122.4 yuan, and 20 table tennis balls. Each ball is more expensive than each ping-pong ball, 0.2 yuan.

(1) RMB per ball? (2) Yuan per table tennis?

The formula is122.4 ÷ 36122.4 ÷ 36-0.2.