Mrs Kong gave Anna and Opal some money each on Tuesday. On Wednesday, Anna gave
15 of the amount she had to Opal. On Thursday, Opal gave
16 of the amount she had to Anna. In the end, Anna had $29 and Opal had $25. How much did Opal had more than Anna at first?
| |
Anna |
Opal |
Total |
| Before 1 |
5 u |
? |
$54 |
| Change 1 |
- 1 u |
+ 1 u |
|
| After 1 |
4 u |
6 p |
$54 |
| Before 2 |
$29 - 1 p |
6 p |
$54 |
| Change 2 |
+ 1 p |
- 1 p |
|
After 2 |
$29 |
5 p
($25) |
$54 |
Amount that Opal had in the end = 5 p
5 p = 25
1 p = 25 ÷ 5 = 5
Working backwards.
Amount that Anna had after giving to Opal on Wednesday
= 29 - 1 p
= 29 - 5
= $24
4 u = 24
1 u = 24 ÷ 4 = 6
Amount that Anna had at first
= 5 u
= 5 x 6
= $30
Total amount that Anna and Opal had
= 29 + 25
= $54
Amount that Opal had at first
= 54 - 30
= $24
Amount that Anna had more than Opal
= 30 - 24
= $6
Answer(s): $6
