Wendy bought some coins. She gave
15 of the coins to her sister and sold
35 of the remaining coins. After that, she bought another 68 coins and had the same number of coins that she bought at first. How many coins did Wendy buy at first?
| Her sister |
Remaining coins |
Bought coins |
Total |
1x5 =
5 u |
4x5 =
20 u |
|
5x5 =
25 u |
| |
Sold |
Left |
|
|
| |
3x4 |
2x4 |
|
|
| 5 u |
12 u |
8 u |
68 |
|
The remaining number of coins before Wendy bought another 68 coins is repeated. Make the remaining number of coins the same. LCM of 4 and 5 is 20.
Total number of coins at first = 25 u
Number of coins that Wendy had left and bought after that = 8 u + 68
25 u = 8 u + 68
25 u - 8 u = 68
17 u = 68
1 u = 68 ÷ 17 = 4
Total number of coins at first
= 25 u
= 25 x 4
= 100
Answer(s): 100
