Simon had 5 times as many silver notebooks as purple notebooks. After giving away 2 silver notebooks and buying another 42 purple notebooks, he had an equal number of silver and purple notebooks. How many silver notebooks did Simon have at first?
| |
Silver notebooks |
Purple notebooks |
| Before |
5 u |
1 u |
| Change |
- 2 |
+ 42 |
| After |
5 u - 2 |
1 u + 42 |
The number of silver and purple notebooks is the same in the end.
5 u - 2 = 1 u + 42
5 u - 1 u = 42 + 2
4 u = 2 + 42
4 u = 44
1 u = 44 ÷ 4 = 11
Number of silver notebooks that Simon had at first
= 5 u
= 5 x 11
= 55
Answer(s): 55
