A) 60 ml
B) 100 ml
C) 128 ml
D) 68 ml
Correct Answer: B
Solution :
Alcohol \[=\left( \frac{15}{100}\times 400 \right)\text{mL}=60\,\,\text{mL}\] |
Water = 340 mL |
Let x mL of alcohol be added. |
Then, \[\frac{60+x}{400+x}\times 100=32\] |
\[\Rightarrow \] \[\frac{60+x}{400+x}=\frac{32}{100}=\frac{8}{25}\] |
\[\Rightarrow \] \[1500+25x=3200+8x\] |
\[\Rightarrow \] \[17x=1700\] |
\[\therefore \] \[x=100\] |
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