The shepherd drove a flock of sheep to eat grass. After running away from a ram, he found that the ratio of ram to ewe was 9: 7 among the remaining sheep. After a while, the escaped sheep returned to the flock, but again. Help you write out the process!

Solution: let x ram and y ewe.

According to the meaning of the question, the equation x- 1:y=9:7 can be listed.

x:y- 1=7:5

You can get X=28 y=2 1.

So there are 49 sheep in this group.

As a representative of math class, my calculation should be correct! )