Number System
The sum of the ages of a son and father is 65 years. After 5 years the age of father will be double of the age of son. What is the age of son ?

17 years
20 years
18 years
19 years

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Number System
In a 150-litre mixture of milk and water, the percentage of milk is 84%. How much water should be added so that the percentage of milk becomes 52.5% ?

95 litre
90 litre
80 litre
85 litre

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