Mrs Quek gave Opal and Gabby some money each on Wednesday. On Thursday, Opal gave
16 of the amount she had to Gabby. On Friday, Gabby gave
13 of the amount she had to Opal. In the end, Opal had $33 and Gabby had $16. How much did Gabby had more than Opal at first?
| |
Opal |
Gabby |
Total |
| Before 1 |
6 u |
? |
$49 |
| Change 1 |
- 1 u |
+ 1 u |
|
| After 1 |
5 u |
3 p |
$49 |
| Before 2 |
$33 - 1 p |
3 p |
$49 |
| Change 2 |
+ 1 p |
- 1 p |
|
After 2 |
$33 |
2 p
($16) |
$49 |
Amount that Gabby had in the end = 2 p
2 p = 16
1 p = 16 ÷ 2 = 8
Working backwards.
Amount that Opal had after giving to Gabby on Thursday
= 33 - 1 p
= 33 - 8
= $25
5 u = 25
1 u = 25 ÷ 5 = 5
Amount that Opal had at first
= 6 u
= 6 x 5
= $30
Total amount that Opal and Gabby had
= 33 + 16
= $49
Amount that Gabby had at first
= 49 - 30
= $19
Amount that Opal had more than Gabby
= 30 - 19
= $11
Answer(s): $11
