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