Question

Based on the relation shown in the graph, evaluate the number of buildings if the number of solar panels used is 560.

• A. 44
• B. 28
• C. 30
• D. 56

Answer 1

The correct option is B 28

We mark three points A, B, and C on the line showing the relation between the number of buildings and the number of solar panels.

Ordered pair of point A $=(2,40)$
Ordered pair of point B $=(4,80)$
Ordered pair of point C $=(6,120)$

No. of buildings	$2$	$4$	$6$
No. of solar panels	$40$	$80$	$120$

For the second column, $40=20\times 2$
For the third column, $80=40\times 2$
For the fourth column, $120=60\times 2$
The relation is, number of solar panels = Number of buildings $\times 20$
The division equation is, number of buildings = Number of solar panels $÷20$
So, the number of buildings if the number of solar panels used is $560=560÷20=28.$
Hence, option A is correct.