The ratio of the ages of A and B is 5:7. After 10 years, the ratio will be 7:9. Find the present age of A. MCQ with Answer and Explanation

The ratio of the ages of A and B is 5:7. After 10 years, the ratio will be 7:9. Find the present age of A.
A. 35 years
B. 20 years
C. 30 years
D. 25 years
Answer: Option D
Solution (By JKSSB Mock Tests)
Let ages 5x, 7x. (5x+10)/(7x+10) = 7/9 → 45x+90 = 49x+70 → 4x=20 → x=5, A=25.

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Practice More Percentage Questions

Question #1
33 1/3 % of 240 is:
A. 70
B. 90
C. 80
D. 60

Correct Answer: Option C


Explanation:
33 1/3% = 1/3, (1/3)×240 = 80.

This question belongs to: Maths Percentage
Question #2
A man gave 20% of his money to his son, 30% of the remainder to his daughter, and 10% of what then remained to charity. He was left with Rs. 10080. Find the total money.
A. Rs. 18000
B. Rs. 22000
C. Rs. 20000
D. Rs. 16000

Correct Answer: Option C


Explanation:
Let total = T. Son 20%, left 80%. Daughter 30% of 80% = 24% of T, left 56%. Charity 10% of 56% = 5.6% of T, left 50.4% = 10080 → T = 10080/0.504 = 20000.

This question belongs to: Maths Percentage
Question #3
A student scored 35% marks and failed by 30 marks. Another scored 45% marks and got 30 marks more than passing. Pass marks are:
A. 250
B. 240
C. 210
D. 225

Correct Answer: Option B


Explanation:
0.35M+30 = 0.45M-30 → 0.1M=60 → M=600. Pass = 0.35×600+30 = 240.

This question belongs to: Maths Percentage