() Fill in the missing number

How far could you drive on 50 gallons of gas

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat

Gabrielle's age is three times mikhail's age. the sum of their ages is 40 . what is mikhail's age? __ years old