Some students board a school bus.
At Bus Stop A,
14 of them alight
and 9 students board.
At Bus Stop B,
35 of the students alight
and 2 board.
If there are 14 students on the bus now,
how many students are on the bus at first?
|
Number of students |
Before |
4 u |
|
Change 1 At Bus Stop A |
- 1 u + 9 |
|
After 1 |
3 u + 9 |
5 p |
Change 2 At Bus Stop B |
|
- 3 p + 2 |
After 2 |
|
14 |
Working backwards.
Number of students in the end = 14
5 p - 3 p = 14 - 2
2 p = 12
1 p = 12 ÷ 2 = 6
5 p = 5 x 6
5 p = 30
3 u + 9 = 5 p
3 u + 9 = 30
3 u = 30 - 9
3 u = 21
1 u = 21 ÷ 3 = 7
Total number of students at first
= 4 u
= 4 x 7
= 28
Answer(s): 28