Some children board a school bus.
At Bus Stop A,
35 of them alight
and 2 children board.
At Bus Stop B,
14 of the children alight
and 11 board.
If there are 17 children on the bus now,
how many children are on the bus at first?
|
Number of children |
Before |
5 u |
|
Change 1 At Bus Stop A |
- 3 u + 2 |
|
After 1 |
2 u + 2 |
4 p |
Change 2 At Bus Stop B |
|
- 1 p + 11 |
After 2 |
|
17 |
Working backwards.
Number of children in the end = 17
4 p - 1 p = 17 - 11
3 p = 6
1 p = 6 ÷ 3 = 2
4 p = 4 x 2
4 p = 8
2 u + 2 = 4 p
2 u + 2 = 8
2 u = 8 - 2
2 u = 6
1 u = 6 ÷ 2 = 3
Total number of children at first
= 5 u
= 5 x 3
= 15
Answer(s): 15