Answer : 3
Q2. Sum of two numbers is 20, and their difference is 4. Find the ratio of the numbers.
Answer : 3:2
Q3. The average age of 30 boys in a class is 15 years. 10 new boys are admitted to the class whose average age is 17 years. Find the average age of all the boys in the class.
Answer : 15.5 years
Q4. Find the average of a-1, a, a+2 and a+3.
Answer : a+1
Q5. In a class, the average score of girls in an examination is 80, and the average score of boys is 90. If the average score of the whole class is 87, find the percentage of boys in the class.
Answer : 70%
Q6. If A:B = 1:2, B:C = 2:3, C:D = 1:3, then find A:D.
Answer : 1:9
Q7. Three years ago, the ratio of the age of Rishu and Ankita was 3:4, and after three years it will become 5:6. Find their present age.
Answer : 12 years & 15 years
Q8. The ratio 4^2.5 : 4^0.5 is same as:-
Answer : 16:1
Q9. Mean of 5 observation is 12. One more observation is included and new means becomes 11. The new observation is:-
Answer : 6
Q10. 3 years ago the age of Rishu was 11 years. The ratio of the present age of Rishu and his father is 1:4. What will be his father’s age after 3 years?
Answer : 59 years
Q11. If A:B:C = 3:4:5, then find A/B:B/C:C/A.
Answer : 45:48:100
Q12. If 1/3 of a =2/5 of b, then find a:b.
Answer : 6:5
Q13. A and B have money in the ratio 4:3. If A gives ₹ 15 to B, the money will be in the ratio 17:18. Find initial amounts that they had.
Answer : ₹ 100 and ₹ 75
Q14. Which of the following represents a correct proportion?
Answer : 6:10::15:25
Q15. The ratio of the age of Ajay and Atul is 4:5. After 5 years the ratio will be 5:6. Find the ratio of their age after 20 years.
Answer : 8:9
