Ahmad had
38 as many marbles as Gillian. After Ahmad gave away 81 marbles, he had 91 less marbles than Gillian. How many marbles did Gillian have?
| |
Ahmad |
Gillian |
| Before |
3 u |
8 u |
| Change |
- 81 |
|
| After |
3 u - 81 |
8 u |
Gillian had 91 more marbles than Ahmad in the end. So, if Ahmad had another 91 marbles, he would have the same number of marbles as Gillian.
8 u = 3 u - 81 + 91
8 u - 3 u = 91 - 81
5 u = 10
1 u = 10 ÷ 5 = 2
Number of marbles that Gillian had at first
= 8 u
= 8 x 2
= 16
Answer: 16
