Some students board a school bus.
At Bus Stop A,
58 of them alight
and 12 students board.
At Bus Stop B,
13 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 |
8 u |
|
Change 1 At Bus Stop A |
- 5 u + 12 |
|
After 1 |
3 u + 12 |
3 p |
Change 2 At Bus Stop B |
|
- 1 p + 4 |
After 2 |
|
16 |
Working backwards.
Number of students in the end = 16
3 p - 1 p = 16 - 4
2 p = 12
1 p = 12 ÷ 2 = 6
3 p = 3 x 6
3 p = 18
3 u + 12 = 3 p
3 u + 12 = 18
3 u = 18 - 12
3 u = 6
1 u = 6 ÷ 3 = 2
Total number of students at first
= 8 u
= 8 x 2
= 16
Answer(s): 16