Praxis Core Math Practice: Ratio Word Problem
Preparing for the Praxis Core Math test? One of the best ways to improve your math skills is to practice solving word problems quickly and accurately.
Today’s practice problem focuses on ratios, a common type of problem that tests your ability to understand relationships between quantities.
🔥 Praxis Math Practice Question
A classroom has 30 students.
The ratio of boys to girls is 2:3.
How many girls are in the class?
A. 10
B. 12
C. 18
D. 20
Take a few seconds to solve the problem before checking the answer.
✅ Correct Answer: C. 18
Solution
The ratio of boys to girls is:
2 : 3
First, add the ratio parts:
2 + 3 = 5
There are 30 students in total, so each ratio part represents:
30 ÷ 5 = 6
Girls represent 3 parts:
3 × 6 = 18
Therefore, the number of girls is:
18
🎯 Praxis Math Tip: How to Solve Ratio Problems
When you see a ratio word problem, follow these simple steps:
Step 1: Identify the ratio
Here, the ratio of boys to girls is:
2 : 3
Step 2: Add the ratio parts
2 + 3 = 5
Step 3: Divide the total by the number of parts
30 ÷ 5 = 6
Step 4: Multiply by the part you need
Girls represent 3 parts:
3 × 6 = 18
So the answer is 18 girls.
🧠 Quick Practice Challenge
Try this one without using a calculator:
A school has 40 students in a class.
The ratio of boys to girls is 3:5.
How many girls are there?
A. 15
B. 20
C. 25
D. 30
Answer: C. 25
Quick Check
Total ratio parts:
3 + 5 = 8
Value of one part:
40 ÷ 8 = 5
Girls:
5 × 5 = 25
Why Ratio Questions Matter
Ratio problems test more than basic arithmetic. They require you to understand how quantities are related and then apply that relationship to a real-world situation.
For Praxis Core Math preparation, practice recognizing the structure of a problem instead of immediately trying to calculate.
When you see a ratio such as 2:3, think:
2 parts + 3 parts = 5 total parts.
That simple step can make many ratio questions much easier.
Final Takeaway
Remember this four-step method:
Identify the ratio → Add the parts → Divide the total → Multiply by the required part
The more ratio word problems you practice, the faster you will recognize the pattern on test day.
How quickly did you solve today’s question?
Try the challenge question above and check your answer before moving on to the next Praxis Core Math practice problem.
This practice question is original educational content created for test preparation and is not an official ETS Praxis question.
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