2.49 people have no discount, 49 * 15 = 735 > 600, so it is not enough.

Suppose we threw x balls, but missed y balls.

x+y= 10，3x-2y= 15 = >y=？

4.( 1/3*π* 1*4.5)/(5*0.02)=? (π is pi)

5. Eight bottles are 4/7 of the wine in the barrel, 1 bottle is114. After filling seven bottles, there is 1/2 left in the bucket, so what is the original? rise

6. Take the total project amount as 1, Party A and Party B complete 2/6 in 2 days, Party B and Party C complete 2/9 in 2 days, and divide the remaining 4/9 by115 to get the answer (why not an integer? )

Ps: the answer is calculated by yourself. Individuals only teach methods, not answers.