You may be thinking of the ratio of 330 cars to 10 cars, but this does not tell you how many SUVs there are. You need to set up a proportion and solve for the unknown number of SUVs. The correct proportion is $\displaystyle\frac{{{3}\ \text{ SUVs}}}{{{10}\ \text{ cars}}}=\frac{{{n}\ \text{ SUVs}}}{{{330}\ \text{ cars}}}\usepackage{cmbright}\Huge\$ . The answer is 99 SUVs.