Sarah and Emma had a total of $660 at first. After Sarah spent
25 of her money and Emma spent
12 of her money, they had the same amount of money left.
- How much money did Sarah have at first?
- Emma has the same number of $10-notes and $5-notes at first. How many $5-notes did she have at first?
| |
Sarah |
Emma |
Total |
Before |
5 u |
2x3 =
6 u |
11 u |
Change |
- 2 u |
- 1x3 =
- 3 u |
|
After |
3 u |
1x3 =
3 u |
|
(a)
The amount that Sarah and Emma had in the end is the same. Make the amount that they each had in the end the same. LCM of 1 and 3 is 3.
Total amount that Sarah and Emma had at first
= 5 u + 6 u
= 11 u
11 u = 660
1 u = 660 ÷ 11 = 60
Amount that Sarah had at first
= 5 u
= 5 x 60
= $300
(b)
Amount that Emma had at first
= 6 u
= 6 x 60
= $360
Emma has the same number of $10-note and $5-note at first.
Value of 1 set of $10-note and $5-note
= 10 + 5
= $15
Number of 10-notes
= 360 ÷ 15
= 24
Answer(s): (a) $300; (b) 24
