Gmatbattle wrote:

A thoroughly blended biscuit mix includes only flour and baking powder. What is the ratio of the number of grams of baking powder to the number of grams of flour in the mix?

(1) Exactly 9.9 grams of flour is contained in 10 grams of the mix.

(2) Exactly 0.3 gram of baking powder is contained in 30 grams of the mix

Dear Gmatbattle,

I'm happy to help.

This is a very easy question. It's almost too easy to appear on the GMAT. Keep in mind, it doesn't provide very rigorous practice for the GMAT Quant section.

Let's say that B is the ratio (baking powder):(whole), and F is the ratio (flour):(whole). Notice that B + F = 1, so that if we know one, we instantly know the other. There is really only one unknown here. The answer to the prompt would be B/F.

Statement #1 tell us F = 9.9/10 = 0.99. From this, we could find B, and then find B/F. This statement is

sufficient.

Statement #2 tell us B = 0.3/30 = 0.01. From this, we could find F, and then find B/F. This statement is

sufficient.

Both statements sufficient. Answer =

(D)Here are some more challenging practice problems on ratios:

http://magoosh.com/gmat/2013/gmat-quant ... oportions/Mike

_________________

Mike McGarry

Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)