Now find the multiplier. What do you multiply 9 by to get 270? That number is 30, so write 30 in each
box in the Multiply By row.
The question asks how many more grams of water are in the solution than there are grams of nitric acid,
so multiply both columns to find the actual numbers.
To find the difference between the number of grams of nitric acid and water, subtract: 210 – 60 = 150.
The correct answer is (C).
Don’t forget that you can use more than one technique to solve a problem. There’s no reason why you
can’t combine the Ratio Box with some form of Plugging In. In fact, if one technique makes the problem
easy, two techniques might make it downright simple!
Here’s a problem for which combining techniques is just the ticket:
17.In Miss Hoover’s class, the ratio of boys to girls is x to y. If the total number of children
in the class is five times the number of boys in the class, and x and y are integers, which
of the following could be the sum of x and y ?
A) 9