Question

when a number is decreased by 45%, the result is 9. what is the original number to the nearest tenth?

Explanation:

Step1: Define original number

Let $x$ = original number.

Step2: Set up equation

A 45% decrease means 55% remains:
$0.55x = 9$

Step3: Solve for $x$

$x = \frac{9}{0.55}$

Step4: Calculate and round

$x \approx 16.36$, rounded to nearest tenth is 16.4

Answer:

16.4