Question 2: The radius of the paint bucket is 10 cm, the volume is 9.42 cubic decimeter, and the 6 buckets ***56.52 cubic decimeter are kilograms. The total area of the basement is 22*4+5*6-4= 1 12 square meters, and 0.5 kg of paint is used per square meter. * * Use 56.

Question 3: A works 2 hours less than B, so the total working time of A is 10 hour, so A processes 120 parts per hour.

Question 4: Suppose the prices of computer models A and B are 8x and 7x respectively, then after the price changes, A is 8x*( 1-75%), and B is 7x+200. If the changed price ratio is 5: 6, x= 1000 is obtained, then the current prices are 6000 and 7200.