Some passengers board a school bus.
At Bus Stop A,
710 of them alight
and 3 passengers board.
At Bus Stop B,
13 of the passengers alight
and 4 board.
If there are 14 passengers on the bus now,
how many passengers are on the bus at first?
|
Number of passengers |
Before |
10 u |
|
Change 1 At Bus Stop A |
- 7 u + 3 |
|
After 1 |
3 u + 3 |
3 p |
Change 2 At Bus Stop B |
|
- 1 p + 4 |
After 2 |
|
14 |
Working backwards.
Number of passengers in the end = 14
3 p - 1 p = 14 - 4
2 p = 10
1 p = 10 ÷ 2 = 5
3 p = 3 x 5
3 p = 15
3 u + 3 = 3 p
3 u + 3 = 15
3 u = 15 - 3
3 u = 12
1 u = 12 ÷ 3 = 4
Total number of passengers at first
= 10 u
= 10 x 4
= 40
Answer(s): 40