7. When my dad was 31 years old, I was just 8 years. Now his age is twice as old as my age. What is my present age
Answers
Answer:
Let x equal the number of yrs between the two ages given (ie 31 and 8) and the time when father is twice as old as he. Then
31 + x = 2(8 + x)
x = 15
So 8 + 15 = 23. he is 23, and his father is twice as old as he (ie 31 + 15 = 46).
Answer:
His present age is = 21 years.
Step-by-step explanation:
- Suppose the speaker was 8 years old before 'x' years.
Now his present age is = (8 + x) years
- Before 'x' years his dad was 31 years old.
The present age of his dad is = (31 + x) years.
- As at present time his dad's age = 2 × his present age.
So we can write, (31 + x) = 2 × (8 + x)
31 + x = 18 + 2x
2x - x = 31 - 18 [Just by rearranging the numbers]
x = 13
- So before 13 years the speaker's age was 8 years. His present age is = 8 + 13 = 21 years.
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