Abi bought some stamps. She gave
15 of the stamps to her brother and sold
56 of the remaining stamps. After that, she bought another 117 stamps and had the same number of stamps that she bought at first. How many stamps did Abi buy at first?
| Her brother |
Remaining stamps |
Bought stamps |
Total |
1x3 =
3 u |
4x3 =
12 u |
|
5x3 =
15 u |
| |
Sold |
Left |
|
|
| |
5x2 |
1x2 |
|
|
| 3 u |
10 u |
2 u |
117 |
|
The remaining number of stamps before Abi bought another 117 stamps is repeated. Make the remaining number of stamps the same. LCM of 4 and 6 is 12.
Total number of stamps at first = 15 u
Number of stamps that Abi had left and bought after that = 2 u + 117
15 u = 2 u + 117
15 u - 2 u = 117
13 u = 117
1 u = 117 ÷ 13 = 9
Total number of stamps at first
= 15 u
= 15 x 9
= 135
Answer(s): 135
