Eva's uncle's weight to her weight is 7 : 2. If Eva puts on 25% more weight, by what percentage must her uncle's weight be reduced by so that their total weight remains unchanged as before? Correct the answer to 1 decimal place.
|
Eva's uncle |
Eva |
Total |
Before |
7 u |
2 u |
9 u |
Change |
- 0.5 u |
+ 0.5 u |
|
After |
6.5 u |
2.5 u |
9 u |
Amount of weight that Eva puts on
= 25% x 2 u
=
25100 x 2 u
= 0.5 u
The total weight remains unchanged.
Percentage of weight that Eva's uncle must be reduced by
=
0.57 x 100%
≈ 7.1% (Correct to 1 decimal place.)
Answer(s): 7.1%