The ratio of milk to water in 80 litres of a mixture is 7 : 3. The water (in litres) to be added to it to make the ratio 2 : 1 is -
A. 4
B. 5
C. 6
D. 8
Answer: Option A
Solution(By Examveda Team)
$$\eqalign{ & {\text{Quantity of milk}} \cr & = \left( {80 \times \frac{7}{{10}}} \right){\text{litres}} \cr & = {\text{56 litres}}{\text{.}} \cr & {\text{Quantity of water}} \cr & = \left( {80 - 56} \right){\text{litres}} \cr & = {\text{24 litres}}{\text{.}} \cr} $$Let the quantity of water to be added be x litres
Then,
$$\eqalign{ & = \frac{{56}}{{24 + x}} = \frac{2}{1} \cr & \Rightarrow 2x = 8 \cr & \Rightarrow x = 4 \cr} $$
Related Questions on Ratio
If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to
A. 2 : 1
B. 14 : 3
C. 7 : 2
D. 1 : 2
If $$\frac{2}{3}$$ of A=75% of B = 0.6 of C, then A : B : C is
A. 2 : 3 : 3
B. 3 : 4 : 5
C. 4 : 5 : 6
D. 9 : 8 : 10
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