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Question:

Ali is x years old and her sister Sara is (10x - 24) years old. Given that Sara is twice as old as Ali, what is Sara’s age?

A 6
Explaination

State the problem in a mathematical equation:
2x=10x−24
2x−10x=−24
−8x=−24
$3597_w69_h37.png$
Ali’s age: X=3
Sarah’s age: 10x–24=$1422_w122_h13.png$