Myah is 4 feet 2 inches tall. her sister, ally, is 10 inches taller. their little brother is half as tall as ally. how tall is their little brother in feet and inches

We let x as the height of Myah
            y as the height of ally
            z as the height of the brother

x = 4ft 2in = 50 inches
y = x + 10 inches
z = y / 2

solving the equations,

y = 50 + 10 = 60 inches
z = 60 / 2 = 30 inches = 2 ft 6 inches tall

Hope this answers the question.

Just divide the x axis (the top) by 2 or multiply the y axis (the bottom) by 2