Some adults board a school bus.
At Bus Stop A,
27 of them alight
and 5 adults board.
At Bus Stop B,
25 of the adults alight
and 2 board.
If there are 14 adults on the bus now,
how many adults are on the bus at first?
|
Number of adults |
Before |
7 u |
|
Change 1 At Bus Stop A |
- 2 u + 5 |
|
After 1 |
5 u + 5 |
5 p |
Change 2 At Bus Stop B |
|
- 2 p + 2 |
After 2 |
|
14 |
Working backwards.
Number of adults in the end = 14
5 p - 2 p = 14 - 2
3 p = 12
1 p = 12 ÷ 3 = 4
5 p = 5 x 4
5 p = 20
5 u + 5 = 5 p
5 u + 5 = 20
5 u = 20 - 5
5 u = 15
1 u = 15 ÷ 5 = 3
Total number of adults at first
= 7 u
= 7 x 3
= 21
Answer(s): 21