Zara bought some stamps. She gave
17 of the stamps to her sister and sold
35 of the remaining stamps. After that, she bought another 207 stamps and had the same number of stamps that she bought at first. How many stamps did Zara buy at first?
| Her sister |
Remaining stamps |
Bought stamps |
Total |
1x5 =
5 u |
6x5 =
30 u |
|
7x5 =
35 u |
| |
Sold |
Left |
|
|
| |
3x6 |
2x6 |
|
|
| 5 u |
18 u |
12 u |
207 |
|
The remaining number of stamps before Zara bought another 207 stamps is repeated. Make the remaining number of stamps the same. LCM of 6 and 5 is 30.
Total number of stamps at first = 35 u
Number of stamps that Zara had left and bought after that = 12 u + 207
35 u = 12 u + 207
35 u - 12 u = 207
23 u = 207
1 u = 207 ÷ 23 = 9
Total number of stamps at first
= 35 u
= 35 x 9
= 315
Answer(s): 315
