Bullet Train H and Bullet Train J had a total of 171 passengers. When 21 passengers from Bullet Train H moved to Bullet Train J, Bullet Train H had 2 times as many passengers as Bullet Train J. How many passengers were there in Bullet Train H at first?
| |
Bullet Train H |
Bullet Train J |
Total |
| Before |
2 u + 21 |
1 u - 21 |
171 |
| Change |
- 21 |
+ 21 |
|
| After |
2 u |
1 u |
171 |
Total number of passengers
= 1 u + 2 u
= 3 u
3 u = 171
1 u = 171 ÷ 3 = 57
Number of passengers in Bullet Train H at first
= 2 u + 21
= 2 x 57 + 21
= 114 + 21
= 135
Answer(s): 135
