Number System
The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ?

82.5
85.5
84.5
83.5

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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 ?

20 years
18 years
19 years
17 years

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