Question

The energy available to primary consumers in an energy pyramid is 800 kilocalories. Approximately how much energy is used by the primary consumers for their physical functions?
A. Less than 720 kilocalories
B. 720 kilocalories
C. 880 kilocalories
D. More than 880 kilocalories

Answer 1

The answer is B, Let me know if you get it right!

Answer 2

Answer:

B. 720 kilocalories

Explanation:

The primary consumers use about 90% of available energy pyramid for their physical functions. In order to solve this exercise, we need to calculate the 90% of 800 kilocalories.

We can state that there is  a direct linear relationship between the kilocalories and the percentage. This means that for a higher percentage the amount of kilocalories will be greater.

We can write :

$\frac{800kilocalories}{100}=\frac{x}{90}$

Where the denominators are percentages.

Solving for x :

$x=\frac{(800kilocalories).(90)}{100}$

$x=720kilocalories$

The correct option is B. 720 kilocalories