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Question

From the following graph, the amount of sand (in cubic feet) required for 380 cubic feet of basking area will be

A
106
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B
114
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C
124
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D
148
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Solution

The correct option is B 114
You know, unit rate = change in ychange in x

Consider the points (60, 18) and (100, 30).

∴ Unit rate of the graph= change in ychange in x
=y2y1x2x1
=301810060
=1240
=0.3

So, the equation will be y=0.3x

Here value of x will be 380 cubic feet.
∴ Putting that value, you get the amount of sand required:
=380×0.3
=114 cubic feet.

So, the amount of sand required for 380 cubic feet of basking area is 114 cubic feet.

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