Vaidev and Bobby had 60 pens. After Vaidev gave 12 pens to Bobby. Bobby, in return, gave half of his pens to Vaidev. In the end, Vaidev had twice as many pens as Bobby. How many pens did Vaidev have at first?
| |
Vaidev |
Bobby |
Total |
| Before |
1 u + 12 |
2 u - 12 |
60 |
| Change 1 |
- 12 |
+ 12 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
60 |
Total number of pens that Vaidev and Bobby had at first and in the end remains unchanged.
Total number of pens
= 2 u + 1 u
= 3 u
1 u = 60 ÷ 3 = 20
Number of pens that Vaidev had at first
= 1 u + 12
= 20 + 12
= 32
Answer(s): 32
