Some students board a school bus.
At Bus Stop A,
15 of them alight
and 11 students board.
At Bus Stop B,
35 of the students alight
and 2 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 |
- 1 u + 11 |
|
After 1 |
4 u + 11 |
5 p |
Change 2 At Bus Stop B |
|
- 3 p + 2 |
After 2 |
|
16 |
Working backwards.
Number of students in the end = 16
5 p - 3 p = 16 - 2
2 p = 14
1 p = 14 ÷ 2 = 7
5 p = 5 x 7
5 p = 35
4 u + 11 = 5 p
4 u + 11 = 35
4 u = 35 - 11
4 u = 24
1 u = 24 ÷ 4 = 6
Total number of students at first
= 5 u
= 5 x 6
= 30
Answer(s): 30