On a test Selena answered 26 out of 30 question correctly. what portion of her answer was correct

Part/Whole=Percent/100

Part=26

Whole=30

Percent = Variable because that is what you want to find out

So now it is 26/30=X/100

You then cross multiply and you get

2600=30X

Divide by 30 and your answer is 86.66667. She got 86.66667% of her questions right. I am not sure if you need to round that or not.

Another way you can do it is Divide 26:30=.866667 and then multiply by 100 to get 86.66667.