Ivory's uncle's weight to her weight is 7 : 3. If Ivory puts on 10% 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.
| |
Ivory's uncle |
Ivory |
Total |
| Before |
7 u |
3 u |
10 u |
| Change |
- 0.3 u |
+ 0.3 u |
|
| After |
6.7 u |
3.3 u |
10 u |
Amount of weight that Ivory puts on
= 10% x 3 u
=
10100 x 3 u
= 0.3 u
The total weight remains unchanged.
Percentage of weight that Ivory's uncle must be reduced by
=
0.37 x 100%
≈ 4.3% (Correct to 1 decimal place.)
Answer(s): 4.3%
