CalTheGreat

This site has the same question with a reasonable explanation:

Correct!

Hint:

The common denominator will be 60.

Hope this helps!

This article will help :D

This site will help:

This is not the exact question, but it will help!

Hint:

The total score will add up to: 81*5=405

Add up the first three: 231

Hence, the added value of the two test scores will be 174. Now, find the value of the two scores :D

Hope this helped!

I am not so great on these questions, but here is a similar question that will definitely help you!

Inverse formula: y=k/x

In this case, 2=k/4

k=8

An equation would be: y=8/x

Hope this helped!

Hm.... Melody is right. You should appreciate people trying to help you. Nchang did not know, so I don't think he should be punished this time....

However, if you are asking a question, it would be nice if you would answer back if someone answers or asks you a question.

Best,