Some students board a school bus.
At Bus Stop A,
14 of them alight
and 10 students board.
At Bus Stop B,
47 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 + 10 |
|
After 1 |
3 u + 10 |
7 p |
Change 2 At Bus Stop B |
|
- 4 p + 2 |
After 2 |
|
14 |
Working backwards.
Number of students in the end = 14
7 p - 4 p = 14 - 2
3 p = 12
1 p = 12 ÷ 3 = 4
7 p = 7 x 4
7 p = 28
3 u + 10 = 7 p
3 u + 10 = 28
3 u = 28 - 10
3 u = 18
1 u = 18 ÷ 3 = 6
Total number of students at first
= 4 u
= 4 x 6
= 24
Answer(s): 24