Winnie bought some pens. She gave
17 of the pens to her brother and sold
35 of the remaining pens. After that, she bought another 230 pens and had the same number of pens that she bought at first. How many pens did Winnie buy at first?
| Her brother |
Remaining pens |
Bought pens |
Total |
1x5 =
5 u |
6x5 =
30 u |
|
7x5 =
35 u |
| |
Sold |
Left |
|
|
| |
3x6 |
2x6 |
|
|
| 5 u |
18 u |
12 u |
230 |
|
The remaining number of pens before Winnie bought another 230 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 Winnie had left and bought after that = 12 u + 230
35 u = 12 u + 230
35 u - 12 u = 230
23 u = 230
1 u = 230 ÷ 23 = 10
Total number of pens at first
= 35 u
= 35 x 10
= 350
Answer(s): 350
