Nora and Opal had a total of $700 at first. After Nora spent
14 of her money and Opal spent
12 of her money, they had the same amount of money left.
- How much money did Nora have at first?
- Opal has the same number of $10-notes and $5-notes at first. How many $5-notes did she have at first?
|
Nora |
Opal |
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 Nora and Opal 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 Nora and Opal had at first
= 4 u + 6 u
= 10 u
10 u = 700
1 u = 700 ÷ 10 = 70
Amount that Nora had at first
= 4 u
= 4 x 70
= $280
(b)
Amount that Opal had at first
= 6 u
= 6 x 70
= $420
Opal 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
= 420 ÷ 15
= 28
Answer(s): (a) $280; (b) 28