Wendy bought some pens. She gave
17 of the pens to her sister and sold
25 of the remaining pens. After that, she bought another 187 pens and had the same number of pens that she bought at first. How many pens did Wendy buy at first?
| Her sister |
Remaining pens |
Bought pens |
Total |
1x5 =
5 u |
6x5 =
30 u |
|
7x5 =
35 u |
| |
Sold |
Left |
|
|
| |
2x6 |
3x6 |
|
|
| 5 u |
12 u |
18 u |
187 |
|
The remaining number of pens before Wendy bought another 187 pens is repeated. Make the remaining number of pens the same. LCM of 6 and 5 is 30.
Total number of pens at first = 35 u
Number of pens that Wendy had left and bought after that = 18 u + 187
35 u = 18 u + 187
35 u - 18 u = 187
17 u = 187
1 u = 187 ÷ 17 = 11
Total number of pens at first
= 35 u
= 35 x 11
= 385
Answer(s): 385
