Some students board a school bus.
At Bus Stop A,
35 of them alight
and 12 students board.
At Bus Stop B,
49 of the students alight
and 6 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 |
- 3 u + 12 |
|
After 1 |
2 u + 12 |
9 p |
Change 2 At Bus Stop B |
|
- 4 p + 6 |
After 2 |
|
16 |
Working backwards.
Number of students in the end = 16
9 p - 4 p = 16 - 6
5 p = 10
1 p = 10 ÷ 5 = 2
9 p = 9 x 2
9 p = 18
2 u + 12 = 9 p
2 u + 12 = 18
2 u = 18 - 12
2 u = 6
1 u = 6 ÷ 2 = 3
Total number of students at first
= 5 u
= 5 x 3
= 15
Answer(s): 15