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Let's break this down step-by-step:
* When you were 2 years old, your sister was twice your age
* So if you were 2, your sister was 2 x 2 = 4 years old
Now, you are currently 40 years old. We need to find out how old your sister is now.
To do this, we can use the following equation:
* Sister's current age = Sister's age when you were 2 + (Your current age - 2)
Plugging in the values:
* Sister's current age = 4 + (40 - 2)
* Sister's current age = 4 + 38
* Sister's current age = 42
Therefore, if you are currently 40 years old, and your sister was twice your age when you were 2, then your sister is currently 42 years old.
The math solution is:
* Your age when sister was twice your age: 2 years old
* Sister's age when you were 2: 2 x 2 = 4 years old
* Your current age: 40 years old
* Sister's current age = Sister's age when you were 2 + (Your current age - 2)
* Sister's current age = 4 + (40 - 2) = 4 + 38 = 42 years old