Question

John is x years old and his sister Mary is (5x-12) years old. Given that Mary is twice as old as John, write in terms of x an equation connecting their ages and find their ages ​

Answer 1

Answer: x =4
Mary is 8 and John is 4

Explanation:
John = x
Mary = 5x - 12 or 2x

Solve for x

5x - 12 = 2x

-12 = -3x

X=4

Hope that helps!