Question

You earned a 90% on a science test. You answered 18 questions correctly. How many questions were on the test?

Answer 1

This is an easy one!

Answer = 20. 

(18/20) x 100 = 90%

So, 20 questions!

Answer 2

There were twenty questions on the test, we can figure this out by writing your word problem as an equation: x= the amount of questions there are on the test, with this in mind the equation will be written out 18/x=90%, then do the same to both sides of the equation, divide both sides by .90 which gets rid of the x on the left side and 18 divided by .90 = 20. So X = 20.