MCQ
If two quantities $x$ and $y$ vary directly with each other, then
  • A
    $\frac{\text{x}}{\text{y}}$ remains constant.
  • B
    x – y remains constant.
  • C
    $x + y$ remains constant.
  • $x × y$ remains constant.

Answer

Correct option: D.
$x × y$ remains constant.

If two quantities $x$ and $y$ vary directly with each other, then$\frac{\text{x}}{\text{y}}= k =$ constant. Since, in direct proportion, both $x$ and $y$ increases or decreases together such a manner that the ratio of their corresponding value remains constant.

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