John and Henry had a total of 249 cards at first. After John bought 20 more cards and Henry gave away 11 cards, John now has the same number of cards as Henry. How many cards did John have at first?
| |
John |
Henry |
Total |
| Before |
1 u - 20 |
1 u + 11 |
249 |
| Change |
+ 20 |
- 11 |
|
| After |
1 u |
1 u |
258 |
Total number of cards in the end
= 249 + 20 - 11
= 258
2 u = 258
1 u = 258 ÷ 2 = 129
Number of cards that John had in the end
= 1 u
= 129
Number of cards that John had at first
= 129 - 20
= 109
Answer(s): 109
