Mrs Goh gave Irene and Zara some money each on Wednesday. On Thursday, Irene gave
15 of the amount she had to Zara. On Friday, Zara gave
13 of the amount she had to Irene. In the end, Irene had $14 and Zara had $4. How much did Zara had more than Irene at first?
| |
Irene |
Zara |
Total |
| Before 1 |
5 u |
? |
$18 |
| Change 1 |
- 1 u |
+ 1 u |
|
| After 1 |
4 u |
3 p |
$18 |
| Before 2 |
$14 - 1 p |
3 p |
$18 |
| Change 2 |
+ 1 p |
- 1 p |
|
After 2 |
$14 |
2 p
($4) |
$18 |
Amount that Zara had in the end = 2 p
2 p = 4
1 p = 4 ÷ 2 = 2
Working backwards.
Amount that Irene had after giving to Zara on Thursday
= 14 - 1 p
= 14 - 2
= $12
4 u = 12
1 u = 12 ÷ 4 = 3
Amount that Irene had at first
= 5 u
= 5 x 3
= $15
Total amount that Irene and Zara had
= 14 + 4
= $18
Amount that Zara had at first
= 18 - 15
= $3
Amount that Irene had more than Zara
= 15 - 3
= $12
Answer(s): $12
