Diana bought some stickers. She gave
13 of the stickers to her brother and sold
35 of the remaining stickers. After that, she bought another 66 stickers and had the same number of stickers that she bought at first. How many stickers did Diana buy at first?
| Her brother |
Remaining stickers |
Bought stickers |
Total |
1x5 =
5 u |
2x5 =
10 u |
|
3x5 =
15 u |
| |
Sold |
Left |
|
|
| |
3x2 |
2x2 |
|
|
| 5 u |
6 u |
4 u |
66 |
|
The remaining number of stickers before Diana bought another 66 stickers is repeated. Make the remaining number of stickers the same. LCM of 2 and 5 is 10.
Total number of stickers at first = 15 u
Number of stickers that Diana had left and bought after that = 4 u + 66
15 u = 4 u + 66
15 u - 4 u = 66
11 u = 66
1 u = 66 ÷ 11 = 6
Total number of stickers at first
= 15 u
= 15 x 6
= 90
Answer(s): 90
