If 60 percent of the 10 students are girls, then 6 are girls and 4 are boys. Therefore, the ratio of boys to girls is . This reduces to , which is the correct answer. 

The best deal will be the one in which the ratio of apples to dollars is highest, as this means more apples can be purchased per a given dollar. 

The deal of  apples for  means that the ratio of apples to dollars is . 

This is the highest ratio compared to any of the other deals:

 apples for  has a ratio of apples to dollars of . The ratio of  is higher than the ratio of . ( and )

 apples for  has a ratio of apples to dollars of , but the ratio of  is higher than the ratio of  because the ratio of  can be rewritten as .

 apples for  has a ratio of apples to dollars of  or 

Therefore, the deal of  apples for  is the best one. 

If two girls and three boys get together for a picnic, and each girl brings three sandwiches to share, that means there will be six sandwiches at the picnic because .

If each boy brings four mini desserts to share, that means there will be twelve mini desserts at the picnic because . 

Therefore, the ratio of sandwiches to desserts at the picnic will be , which is equal to .

A ratio is really nothing more than division. Many people will write it like this:

We can also write it like this:

Before being able to answer, you need to see if you can reduce this fraction—which you can! Go ahead and factor it into its primes:

You can cancel out a .  This leaves you with:

Therefore, the ratio is:

The question is asking for the ratio of girls to the total amount of students at the assembly. If there are 21 boys, then there are 42 girls. The ratio is part to whole and would be represented as a fraction as:

This fraction can be reduced to simplest form by dividing the number and the denominator by the Greatest Common Factor or GCF, which is 21.  The correct answer is:

To solve this problem, set up the proportion:

Cross multiply:

Divide both sides by 12 to isolate x.

Since there are a total of five shares in the ratio 

and you get two shares, your share is  of the total.  

and 

Your share is .

Since the first two have to be equal, you can start by representing them by  share apiece.  

The third invested twice the amount that each of the others did so you double their share to get .  

So the first friend gets one share and so does the second.  

The third friend gets two shares and the ratios looks like,

 .

The ratio of blue marbles to white marbles is , but this is not in simplest form. Rewrite this as a fraction for simplicity, then divide both numbers by :

In simplest form, the ratio is 

If a fruit punch recipe calls for 1 cup or orange juice, half a cup of pineapple juice, and 2 cups of soda, the ratio would be:

Multiply all three numbers by 2: