Fred and Asher had some allowance in the ratio of 3 : 8. They shared some money to buy a necklace for their mother. The ratio of the amount paid by Fred to the amount paid by Asher was 1 : 3. If Asher was left with $22 and Fred had spent
23 of his money, how much was the necklace they bought?
| |
Fred |
Asher |
| Before |
3 u |
8 u |
| Change |
- 2 u |
- 6 u |
Comparing the
amounts spent |
- 1x2 |
- 3x2 |
| After |
1 u |
22 |
The amount that Fred spent is repeated. Make the amount that Fred spent the same. LCM of 1 and 2 is 2.
Amount that Fred spent
=
23 x 3 u
= 2 u
Amount that Asher spent
= 3 x 2 u
= 6 u
Amount that Asher had left
= 8 u - 6 u
= 2 u
2 u = 22
1 u = 22 ÷ 2 = 11
Price of the necklace
= 2 u + 6 u
= 8 u
= 8 x 11
= $88
Answer(s): $88
