Question

If 45% of a number is 0.9 more than 30% of it, what is the number?

• A. 6
• B. 7
• C. 8
• D. 9

Answer 1

Answer:

A. 6

Let the number be (x).

According to the question:

$45\% \text{ of } x = 30\% \text{ of } x + 0.9$
$0.45x = 0.30x + 0.9$
$0.15x = 0.9$
$x = \frac{0.9}{0.15} = 6$

$Answer: (\boxed{6})$

Check:

• 45% of 6 = 2.7

• 30% of 6 = 1.8

• Difference = 2.7 − 1.8 = 0.9