The average height of boys in the class is 160 cm. How much are you taller than average if his height is 168 cm?

1) Determine the height of this boy by composing an equation using proportion, where we take his height for x, and the average height for 100 percent.

160 centimeters – 100 percent;

168 centimeters – x percent.

x = 100 * 168/160;

x = 16800/160;

x = 105.

This boy is 105 percent of the average height for boys in this class.

2) Let’s calculate how many percent his growth is higher than the average in this class.

105 – 100 = 5.

This boy is 5 percent taller than the class average.

Answer: 5 percent.