word problem

Question

suppose their are 20 questions on a multiple choice test. if 25%of the answer are choice B how many of the answers are not choice B

Answer 1

If we know that 25% of the answers are choice B, that means that 75% of the answers are not choice B.

 

So, we need to find out what 75% of 20 is.

 

To find this out, we can multiply 20 by 75%. The easiest way to do this would be to turn 75% into its decimal form: .75

 

Now, we multiply 20 x .75 

 

20 x .75 = 15

 

That means, 15 of the problems are not answer choice B.

 

We can check our work by making sure that 25% of 20 is 5.

 

20 x .25 = 5

 

Therefore, our answer is 15 of the answers are not choice B.