Question

Sarah's age is five less than twice her sister's age. Sarah is fifteen years old.

Which equation could you use to solve for the age of Sarah's sister?

2 x - 5 = 15
15 - 5 = 2 x
15 = 5 - 2 x
2(15) - 5 = x

Answer 1

To solve for the age of Sarah's sister using the information given:

1. We know that Sarah's age (which is 15) is five less than twice her sister's age.
2. If we let the sister's age be represented by \( x \), we can write the relationship as follows:

\[
15 = 2x - 5
\]

Rearranging this equation to solve for \( x \) (the age of Sarah's sister) leads us to the correct initial equation from the provided options.

The equivalent equation you could use to solve for Sarah's sister's age is:

\[
2x - 5 = 15
\]

So, the correct answer is:

**2 x - 5 = 15**