David and Japheth had a total of 236 stamps at first. After David bought 23 more stamps and Japheth gave away 11 stamps, David now has the same number of stamps as Japheth. How many stamps did David have at first?
| |
David |
Japheth |
Total |
| Before |
1 u - 23 |
1 u + 11 |
236 |
| Change |
+ 23 |
- 11 |
|
| After |
1 u |
1 u |
248 |
Total number of stamps in the end
= 236 + 23 - 11
= 248
2 u = 248
1 u = 248 ÷ 2 = 124
Number of stamps that David had in the end
= 1 u
= 124
Number of stamps that David had at first
= 124 - 23
= 101
Answer(s): 101
