Question

in our solar system there are 6 out of 8 planets have moons what percentage of the planets that have moons

Answer 1

You'd take 6/8 and then you'd get .75 but for percentages you move the decimal to the right 2 places which is 75%

Answer 2

For this case we can make the following rule of three to solve the problem:

8 planets -------------------> 100%

6 planets -------------------> x

From here, we clear the value of x.

We have then:

$x = (\frac{6}{8}) * (100)\\x = 75$

Answer:

the percentage of the planets that have moons is 75%