Question

energy output = 25 units
energy input = 100 units
if you want to calculate energy efficiency,
what value should be substituted into the
green box?
? ÷ □ = energy efficiency
energy output ÷ energy input = energy efficiency
hint: enter a number.

Explanation:

Step1: Recall efficiency formula

Energy Efficiency = $\frac{\text{Energy Output}}{\text{Energy Input}}$

Step2: Identify green box value

The green box is the numerator, so use the given energy output value.

Answer:

25