Some students board a school bus.
At Bus Stop A,
38 of them alight
and 5 students board.
At Bus Stop B,
710 of the students alight
and 11 board.
If there are 17 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 |
- 3 u + 5 |
|
After 1 |
5 u + 5 |
10 p |
Change 2 At Bus Stop B |
|
- 7 p + 11 |
After 2 |
|
17 |
Working backwards.
Number of students in the end = 17
10 p - 7 p = 17 - 11
3 p = 6
1 p = 6 ÷ 3 = 2
10 p = 10 x 2
10 p = 20
5 u + 5 = 10 p
5 u + 5 = 20
5 u = 20 - 5
5 u = 15
1 u = 15 ÷ 5 = 3
Total number of students at first
= 8 u
= 8 x 3
= 24
Answer(s): 24