A) 6 L
B) 6.5 L
C) 3.5
D) 5 L
Correct Answer: D
Solution :
Let x L of water should be added to change the percentage of water. Quantity of water in 40 L of mixture \[=\frac{40\times 10}{100}=4\,L\] \[\therefore \] \[\frac{x+4}{40+x}=\frac{20}{100}\] \[\Rightarrow \] \[5x+20=40+x\] \[\Rightarrow \] \[x=\frac{20}{4}=5\] \[\therefore \] 5 L of water should be mixed.You need to login to perform this action.
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