6.3.5 Ratio and Rate Problems

Two methods are given, both equally good, though I will primarily be focused on the equivalent fractions method. You will notice that with the equivalent fractions, the totals are in the denominator while what you're looking for (in this case, how many like gel toothpaste) are in the numerator. 

Since 3 x 50 equals 150, we will also multiply the numerator (2) by 50 as well in order to get our final answer of 100. 

We can also use a process called Cross-Multiply and Divide. Using this method, we would take 2 x 150 (since they are across from each other) and then divide by 3. You will get the same answer.