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?

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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?

A1800

B1200

C1000

D1500

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

Related Questions:

A, B and C started a business. They partnered for 6 months, 12 months and 14 months respectively. If their profit is in the ratio 5:4:7 respectively, then the ratio of their respective investments is__________

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No.1 PSC Learning App

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?

B. 1200

Read Explanation:

A, B and C started a business. They partnered for 6 months, 12 months and 14 months respectively. If their profit is in the ratio 5:4:7 respectively, then the ratio of their respective investments is__________

രണ്ട് സംഖ്യകൾ തമ്മിലുള്ള അംശബന്ധം 2 : 3, അവയുടെ തുക 225 ആയാൽ വലിയ സംഖ്യയേത് ?

A : B = 3 : 4 B : C = 6 : 9 ആയാൽ A : B : C എത്ര ?