Question

78% of x is 3.822, y% of 8 is 0.248
What is the answer?

Answer 1

x = 4.9

y = 3.1%

Explanation:

When dealing with percents, we can use the formula

Pa=b, where P is the percentage (either as a decimal or as a fraction over 100).

We can think of the formula saying P% of a is b.

In this first example, the percentage can be converted to a decimal.

Depending on which what numbers, we have and trying to find, we plug it in to the formula accordingly:

`0.78x=3.822\\x=4.9`

In this second example, we should make the percentage a fraction over 100 since it's unknown:

`8((y)/(100))=0.248\\ (y)/(100)=0.031\\ y=3.1`