Wesley had
79 as many marbles as Zara. After Wesley gave away 31 marbles, he had 71 less marbles than Zara. How many marbles did Zara have?
|
Wesley |
Zara |
Before |
7 u |
9 u |
Change |
- 31 |
|
After |
7 u - 31 |
9 u |
Zara had 71 more marbles than Wesley in the end. So, if Wesley had another 71 marbles, he would have the same number of marbles as Zara.
9 u = 7 u - 31 + 71
9 u - 7 u = 71 - 31
2 u = 40
1 u = 40 ÷ 2 = 20
Number of marbles that Zara had at first
= 9 u
= 9 x 20
= 180
Answer: 180