A) 70 kg
B) 30 kg
C) 50 kg
D) 10 kg
Correct Answer: A
Solution :
Total gain %=. 10% \[\therefore \] gain = 10% of 100 kg. \[=100kg\times \frac{10}{100}=10kg.\] Let the part of 7% gain = xkg. and the part of 17% gain\[=(100-x)kg\] \[\therefore \] By question, 7% of \[x+17%\] of \[(100-x)=10\,kg\] \[\Rightarrow \] \[\frac{7x}{100}+\frac{(100-x)17}{100}=10\] \[\Rightarrow \] \[\frac{7x+1700-17x}{100}=10\] \[\Rightarrow \] \[-10x+1700=1000\] \[\Rightarrow \] \[-10x=1000-1700=-700\] \[\Rightarrow \] \[x=\frac{-700}{-10}=70kg.\]You need to login to perform this action.
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