Some students board a school bus.
At Bus Stop A,
25 of them alight
and 10 students board.
At Bus Stop B,
14 of the students alight
and 4 board.
If there are 16 students on the bus now,
how many students are on the bus at first?
|
Number of students |
Before |
5 u |
|
Change 1 At Bus Stop A |
- 2 u + 10 |
|
After 1 |
3 u + 10 |
4 p |
Change 2 At Bus Stop B |
|
- 1 p + 4 |
After 2 |
|
16 |
Working backwards.
Number of students in the end = 16
4 p - 1 p = 16 - 4
3 p = 12
1 p = 12 ÷ 3 = 4
4 p = 4 x 4
4 p = 16
3 u + 10 = 4 p
3 u + 10 = 16
3 u = 16 - 10
3 u = 6
1 u = 6 ÷ 3 = 2
Total number of students at first
= 5 u
= 5 x 2
= 10
Answer(s): 10