Exercise :: Ratio and Proportion  General Questions
 Ratio and Proportion  Important Formulas
 Ratio and Proportion  General Questions
6.  The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio? 

Answer: Option C Explanation: Originally, let the number of boys and girls in the college be 7x and 8x respectively. Their increased number is (120% of 7x) and (110% of 8x).

7.  Salaries of Ravi and Sumit are in the ratio 2 : 3. If the salary of each is increased by Rs. 4000, the new ratio becomes 40 : 57. What is Sumit's salary? 

Answer: Option D Explanation: Let the original salaries of Ravi and Sumit be Rs. 2x and Rs. 3x respectively.
57(2x + 4000) = 40(3x + 4000) 6x = 68,000 3x = 34,000 Sumit's present salary = (3x + 4000) = Rs.(34000 + 4000) = Rs. 38,000. 
8.  If 0.75 : x :: 5 : 8, then x is equal to: 

Answer: Option B Explanation:

9.  The sum of three numbers is 98. If the ratio of the first to second is 2 :3 and that of the second to the third is 5 : 8, then the second number is: 

Answer: Option B Explanation: Let the three parts be A, B, C. Then,

10.  If Rs. 782 be divided into three parts, proportional to : : , then the first part is: 

Answer: Option D Explanation: Given ratio = : : = 6 : 8 : 9.
