EasyMath· Problem-Solving and Data Analysis· Ratios, rates, proportional relationships, and units· MCQ
x
y
1
4
3
12
5
20
40
k
In the table above, the ratio of y to x for each ordered pair is constant. What is the value of k ?
A
28
B
36
C
80
D
160
Correct answer: D
Explanation
Choice D is correct. Since the ratio of y to x is constant for each ordered pair in the table, the first row can be used to determine that the ratio of y to x is 4 to 1. The proportion can be used to solve for k. Multiplying each side of the equation by 40 yields .
Choice A is incorrect. This is the value of y when the value of x is 7, not 40. Choice B is incorrect and may result from subtracting 4 from 40 instead of multiplying 40 by 4. Choice C is incorrect and may result from incorrectly setting up the proportion.
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id cb_question_bank:2726fb63-9fd0-4139-96dd-b306dc4d3770 · question 3f236a64 · IBN 029578-DC
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