Anna's father's weight to her weight is 7 : 4. If Anna puts on 30% more weight, by what percentage must her father's weight be reduced by so that their total weight remains unchanged as before? Correct the answer to 1 decimal place.
|
Anna's father |
Anna |
Total |
Before |
7 u |
4 u |
11 u |
Change |
- 1.2 u |
+ 1.2 u |
|
After |
5.8 u |
5.2 u |
11 u |
Amount of weight that Anna puts on
= 30% x 4 u
=
30100 x 4 u
= 1.2 u
The total weight remains unchanged.
Percentage of weight that Anna's father must be reduced by
=
1.27 x 100%
≈ 17.1% (Correct to 1 decimal place.)
Answer(s): 17.1%