Some students board a school bus.
At Bus Stop A,
79 of them alight
and 8 students board.
At Bus Stop B,
58 of the students alight
and 8 board.
If there are 14 students on the bus now,
how many students are on the bus at first?
|
Number of students |
Before |
9 u |
|
Change 1 At Bus Stop A |
- 7 u + 8 |
|
After 1 |
2 u + 8 |
8 p |
Change 2 At Bus Stop B |
|
- 5 p + 8 |
After 2 |
|
14 |
Working backwards.
Number of students in the end = 14
8 p - 5 p = 14 - 8
3 p = 6
1 p = 6 ÷ 3 = 2
8 p = 8 x 2
8 p = 16
2 u + 8 = 8 p
2 u + 8 = 16
2 u = 16 - 8
2 u = 8
1 u = 8 ÷ 2 = 4
Total number of students at first
= 9 u
= 9 x 4
= 36
Answer(s): 36