SSAT Math Question 611: Answer and Explanation
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Question: 611
5. One-half of the 400 students at Booth Junior High School are girls. Of the girls at the school, the ratio of those who ride a school bus to those who walk is 7:3. What is the total number of girls who walk to school?
- A. 10
- B. 30
- C. 60
- D. 120
Correct Answer: C
Explanation:
Take the question one step at a time: Half of the 400 students are girls, so there are 200 girls. This number will go in the total column for the actual number row. The ratio of the girls who ride the bus to those who walk is 7:3, which will go in the ratio row of the box. Add 7 and 3 to find the total number: 10. 10 times what equals 200? If 10 × 20 = 200, then the multiplier is 20. The question asks how many girls walk to school, so multiply 3 × 20 = 60 to get the total girls walking to school. The correct answer is (C).
