Emma and Sabrina had a total of $100 at first. After Emma spent
14 of her money and Sabrina spent
12 of her money, they had the same amount of money left.
- How much money did Emma have at first?
- Sabrina has the same number of $10-notes and $2-notes at first. How many $2-notes did she have at first?
| |
Emma |
Sabrina |
Total |
Before |
4 u |
2x3 =
6 u |
10 u |
Change |
- 1 u |
- 1x3 =
- 3 u |
|
After |
3 u |
1x3 =
3 u |
|
(a)
The amount that Emma and Sabrina 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 Emma and Sabrina had at first
= 4 u + 6 u
= 10 u
10 u = 100
1 u = 100 ÷ 10 = 10
Amount that Emma had at first
= 4 u
= 4 x 10
= $40
(b)
Amount that Sabrina had at first
= 6 u
= 6 x 10
= $60
Sabrina has the same number of $10-note and $2-note at first.
Value of 1 set of $10-note and $2-note
= 10 + 2
= $12
Number of 10-notes
= 60 ÷ 12
= 5
Answer(s): (a) $40; (b) 5
