Cracking The SAT Premium

Now you have enough information to answer any question you might be asked. Here are some examples:

• What is the ratio, of boys to girls? You can see easily from the ratio (parts) row of the box that
  the ratio is 2:1.


• What is the ratio of girls to boys? You can see easily from the ratio (parts) row of the box that the
  ratio is 1:2.


• What is the total number of boys in the class? You can see easily from the bottom row of the box
  that it is 16.


• What is the total number of girls in the class? You can see easily from the bottom row of the box
  that it is 8.


• What fractional part of the class is boys? There are 16 boys in a class of 24, so the fraction

representing    the boys    is   ,  which   can be  reduced to  .

As you can see, the Ratio Box is an easy way to find, organize, and keep track of information on ratio
problems. And it works the same no matter what information you are given. Just remember that all the
boxes in the Multiply By row will always contain the same number.

Here’s another example:

12.An   acidic  solution    is  mixed   so  that    the mass    ratio   of  nitric  acid    to  water   is  2:7.    If  a   total

of  270 grams   of  acid    solution    is  mixed,  how many    more    grams   of  water   are there   than

the nitric  acid?

A) 60

B) 110

C) 150

D) 210

Here’s How to Crack It

For this question, your Ratio Box should look like this: