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In the table, $x$ and $y$ vary directly. What number should replace the "?"?

Class 8Direct and Inverse ProportionsDirect and Inverse Proportions

A17
B24
C21
D19

Step-by-Step Solution

\frac{y}{x} = \frac{6}{2} = 3

in every column, so

y = 3 \times 7 = 21

. (17 adds 10 because 15 was 10 more than 5 — direct proportion multiplies, it does not add.)

Answer: C) 21

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