Vaidev had 4 times as many silver pencils as grey pencils. After giving away 3 silver pencils and buying another 30 grey pencils, he had an equal number of silver and grey pencils. How many silver pencils did Vaidev have at first?
| |
Silver pencils |
Grey pencils |
| Before |
4 u |
1 u |
| Change |
- 3 |
+ 30 |
| After |
4 u - 3 |
1 u + 30 |
The number of silver and grey pencils is the same in the end.
4 u - 3 = 1 u + 30
4 u - 1 u = 30 + 3
3 u = 3 + 30
3 u = 33
1 u = 33 ÷ 3 = 11
Number of silver pencils that Vaidev had at first
= 4 u
= 4 x 11
= 44
Answer(s): 44
