Question

X and y vary directly. When x is 24, y is 8. What is x when y is 9?

Answer 1

`x=27`

Explanation:

As `x` and `y` vary directly then `xpropy` i.e. `x=ky`, where `k` is a constant.

When `x=24`, `y=8` i.e. `24=k×8` and therefore

`k=24/8=3`

and relation between `x` and `y` is hence `x=3y`

and when `y=9`, `x=3×9=27`.