Charlie had
59 as many cards as Opal. After Charlie bought another 6 cards, he had 10 less cards than Opal. How many cards did Charlie have at first?
| |
Charlie |
Opal |
| Before |
5 u |
9 u |
| Change |
+ 6 |
|
| After |
5 u + 6 |
9 u |
Opal had 10 more cards than Charlie in the end. So, if Charlie had another 10 cards, he would have the same number of cards as Opal.
9 u = 5 u + 6 + 10
9 u - 5 u = 6 + 10
4 u = 16
1 u = 16 ÷ 4 = 4
Number of cards that Charlie had at first
= 5 u
= 5 x 4
= 20
Answer: 20
