Multiple choice general knowledge

Today is Jack's 12th birthday and his father's 40th birthday.How many years from today will jack,s father be twice as old as Jack is at that time?

  1. 12

  2. 14

  3. 16

  4. 18

  5. 20
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let Jack's current age = 12, father's current age = 40. In x years, Jack will be 12+x and father will be 40+x. We need 40+x = 2(12+x), so 40+x = 24+2x, therefore x = 16. After 16 years, Jack will be 28 and father will be 56, which is exactly double.

AI explanation

To solve this problem, let's break it down step by step.

Let's assume that the number of years from today is x.

Currently, Jack is 12 years old, and his father is 40 years old.

In x years, Jack will be (12 + x) years old, and his father will be (40 + x) years old.

According to the problem, Jack's father will be twice as old as Jack is at that time. Mathematically, this can be represented as:

40 + x = 2(12 + x)

Now, let's solve this equation to find the value of x.

40 + x = 2(12 + x) 40 + x = 24 + 2x

Simplifying, we get: x = 16

So, the number of years from today when Jack's father will be twice as old as Jack is at that time is 16 years.

Therefore, the correct answer is C) 16.

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