Ivory's mother's weight to her weight is 7 : 2. If Ivory puts on 40% more weight, by what percentage must her mother's weight be reduced by so that their total weight remains unchanged as before? Correct the answer to 1 decimal place.
|
Ivory's mother |
Ivory |
Total |
Before |
7 u |
2 u |
9 u |
Change |
- 0.8 u |
+ 0.8 u |
|
After |
6.2 u |
2.8 u |
9 u |
Amount of weight that Ivory puts on
= 40% x 2 u
=
40100 x 2 u
= 0.8 u
The total weight remains unchanged.
Percentage of weight that Ivory's mother must be reduced by
=
0.87 x 100%
≈ 11.4% (Correct to 1 decimal place.)
Answer(s): 11.4%