Question

In a school, the ratio of boys and girls is 4:5. When 100 girls leave the school, the ratio becomes 6:7. How many boys are there in the school?

• A. 1800
• B. 1200
• C. 1000
• D. 1500

Answer 1

Answer:

B. 1200

Read Explanation:

Let number of boys= 4x and number of girls= 5x According to the question 4x/(5x-100)=6/7 =>28x =6(5x-100) =>28x =30x-600 2x =600 x=600/2=300 Number of boys= 4x=4x300=1200

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