Question

15% of x=3 what is the value of x

Answer 1

x = 0.45 (15% of 3)

Explanation:

x has a value of 3

find 15% of 3

Introduction:

'Percent (%)' means 'out of one hundred':

15% = 15 'out of one hundred',

p% is read p 'percent',

15% = 15/100 = 15 ÷ 100

Calculate percentage:

15% × 3 =

15/100 × 3 =

(15 ÷ 100) × 3 =

15 × 3 ÷ 100 =

45 ÷ 100 =

0.45

Proof.

How do we check the result?

If 15% × 3 = 0.45 =>

Divide 0.45 by 3...

... And see if we get as a result: 15%

Note:

100/100 = 100 ÷ 100 = 100% = 1

Multiply a number by the fraction 100/100,

... and its value doesn't change.

n/100 = n%, any number.

Calculate the percent value:

0.45 ÷ 3 =

0.15 =

0.15 × 100/100 =

(0.15 × 100)/100 =

15/100 =

15%

So we have proven that the calculations are correct.

Answer: Percentage of

15% of 3 = 0.45

Answer 2

0.45.

Explanation:

15% of 3 is 0.45, so if we take 15% of x=3 then the value of x would now be 0.45.