Feng Jia's score: (240+96)÷2= 168 (points)-according to the sum-difference formula.

Liu Yu's score: 240- 168=72 (points)

Then figure out how many shots Feng Jia and Liu Yu each hit:

The bullet hit by Feng Jia:10-(20×10-168) ÷ (20+12) = 9 (rounds)-Suppose Feng Jiaquan hits, which is 32 points different from the actual situation, because the difference between missed hit and hit is 32 points.

The bullet hit by Liu Yu:10-(20×10-72) ÷ (20+12) = 6 (rounds)-same as above, assuming that Liu Yuquan hits, this is different from the actual situation 128 points.