Ahmad had
29 as many marbles as Sarah. After Ahmad bought another 91 marbles, he had 14 less marbles than Sarah. How many marbles did Ahmad have at first?
|
Ahmad |
Sarah |
Before |
2 u |
9 u |
Change |
+ 91 |
|
After |
2 u + 91 |
9 u |
Sarah had 14 more marbles than Ahmad in the end. So, if Ahmad had another 14 marbles, he would have the same number of marbles as Sarah.
9 u = 2 u + 91 + 14
9 u - 2 u = 91 + 14
7 u = 105
1 u = 105 ÷ 7 = 15
Number of marbles that Ahmad had at first
= 2 u
= 2 x 15
= 30
Answer: 30