Bobby had a total of 198 red and black paper cranes. After giving away
12 of the red paper cranes and 63 black paper cranes, there was an equal number of red and black paper cranes left. How many red paper cranes did he have at first?
| |
Red paper cranes |
Black paper cranes |
Total |
| Before |
2 u |
1 u + 63 |
198 |
| Change |
- 1 u |
- 63 |
|
| After |
1 u |
1 u |
|
Total number of paper cranes at first
= 2 u + 1 u + 63
= 3 u + 63
3 u + 63 = 198
3 u = 198 - 63
3 u = 135
1 u = 135 ÷ 3 = 45
Number of red paper cranes that Bobby had at first
= 2 u
= 2 x 45
= 90
Answer(s): 90
