D= difference in height
A= Alex's height (1.6 m)
N= Noah's height (1.5A)
Step 1:
D= N - A
substitute N= 1.5 A in for N
D= 1.5(1.6) - 1.6
D= 2.4 - 1.6
D= 0.8 m difference in height
Step 2:
Convert meters to centimeters
1 m = 100 centimeters
0.8 x 100= 80cm
Noah is 80cm taller than Alex.
Hope this helps! :)