Fill in the blanks.
Adam receives some allowance.
If he increases his savings by 30%,
his spending decreases by 70%.
- Amount of savings = _____ u
- Amount of spending = _____ u
- Total amount of allowance = _____ u
- Difference in the amount of savings and spending = _____ u
|
Savings |
Spending |
Before |
10 x 7 = 70 u |
10 x 3 = 30 u |
If change |
+ 3 x 7 = + 21 u |
- 7 x 3 = - 21 u |
After |
13 x 7 = 91 u |
3 x 3 = 9 u |
(a)
Change percentage into units.
30% of savings = 70% of spending
310 of savings =
710 of spending
Make the numerators the same.
LCM of 3 and 7 = 21
3 x 710 x 7 of savings =
7 x 310 x 3 of spending
2170 of savings =
2130 of spending
Amount of savings = 70 u
(b)
Amount of spending = 30 u
(c)
Total amount of allowance
= 70 u + 30 u
= 100 u
(d)
Difference in the amount of savings and spending
= 70 u - 30 u
= 40 u
Answer(s): (a) 70; (b) 30; (c) 100; (d) 40