Fill in the blanks.
Adam receives some allowance.
If he increases his spending by 20%,
his savings decreases by 80%.
- Amount of spending = _____ u
- Amount of savings = _____ u
- Total amount of allowance = _____ u
- Difference in the amount of spending and savings = _____ u
|
Spending |
Savings |
Before |
5 x 4 = 20 u |
5 x 1 = 5 u |
If change |
+ 1 x 4 = + 4 u |
- 4 x 1 = - 4 u |
After |
6 x 4 = 24 u |
1 x 1 = 1 u |
(a)
Change percentage into units.
20% of spending = 80% of savings
15 of spending =
45 of savings
Make the numerators the same.
LCM of 1 and 4 = 4
1 x 45 x 4 of spending =
4 x 15 x 1 of savings
420 of spending =
45 of savings
Amount of spending = 20 u
(b)
Amount of savings = 5 u
(c)
Total amount of allowance
= 20 u + 5 u
= 25 u
(d)
Difference in the amount of spending and savings
= 20 u - 5 u
= 15 u
Answer(s): (a) 20; (b) 5; (c) 25; (d) 15