Zeph had
25 as many marbles as Shiyun. After Zeph gave away 66 marbles, he had 87 less marbles than Shiyun. How many marbles did Shiyun have?
| |
Zeph |
Shiyun |
| Before |
2 u |
5 u |
| Change |
- 66 |
|
| After |
2 u - 66 |
5 u |
Shiyun had 87 more marbles than Zeph in the end. So, if Zeph had another 87 marbles, he would have the same number of marbles as Shiyun.
5 u = 2 u - 66 + 87
5 u - 2 u = 87 - 66
3 u = 21
1 u = 21 ÷ 3 = 7
Number of marbles that Shiyun had at first
= 5 u
= 5 x 7
= 35
Answer: 35
