Some children board a school bus.
At Bus Stop A,
27 of them alight
and 5 children board.
At Bus Stop B,
35 of the children alight
and 4 board.
If there are 14 children on the bus now,
how many children are on the bus at first?
|
Number of children |
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 |
|
- 3 p + 4 |
After 2 |
|
14 |
Working backwards.
Number of children in the end = 14
5 p - 3 p = 14 - 4
2 p = 10
1 p = 10 ÷ 2 = 5
5 p = 5 x 5
5 p = 25
5 u + 5 = 5 p
5 u + 5 = 25
5 u = 25 - 5
5 u = 20
1 u = 20 ÷ 5 = 4
Total number of children at first
= 7 u
= 7 x 4
= 28
Answer(s): 28