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?

Answer 1

Ok so sarah's age is 15 so if her sister's age is x:

\[2x-5=15\]
2x is the twice her sister's age part
and th "-5" is the 5 less part

So add 5 to both sides:\[2x=20\]
Divide by 2:
x=10

Her sister's age is 10!

Answer 2

Thank You that was the correct answer you helped me very much