Bullet Train M and Bullet Train N had a total of 132 passengers. When 15 passengers from Bullet Train M moved to Bullet Train N, Bullet Train M had 3 times as many passengers as Bullet Train N. How many passengers were there in Bullet Train M at first?
| |
Bullet Train M |
Bullet Train N |
Total |
| Before |
3 u + 15 |
1 u - 15 |
132 |
| Change |
- 15 |
+ 15 |
|
| After |
3 u |
1 u |
132 |
Total number of passengers
= 1 u + 3 u
= 4 u
4 u = 132
1 u = 132 ÷ 4 = 33
Number of passengers in Bullet Train M at first
= 3 u + 15
= 3 x 33 + 15
= 99 + 15
= 114
Answer(s): 114
