Jade's uncle's weight to her weight is 7 : 2. If Jade puts on 20% 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.
| |
Jade's uncle |
Jade |
Total |
| Before |
7 u |
2 u |
9 u |
| Change |
- 0.4 u |
+ 0.4 u |
|
| After |
6.6 u |
2.4 u |
9 u |
Amount of weight that Jade puts on
= 20% x 2 u
=
20100 x 2 u
= 0.4 u
The total weight remains unchanged.
Percentage of weight that Jade's uncle must be reduced by
=
0.47 x 100%
≈ 5.7% (Correct to 1 decimal place.)
Answer(s): 5.7%
