Question

The ages of Krish and Vaibhav are in the proportion of 3 : 5. After 9 years, the proportion of their ages will be 3 : 4. Then the current age of Vaibhav is:

A) 10 B) 13 C) 15 D) 18

Answer 1

Answer:

29Q:

The ages of Krish and Vaibhav are in the proportion of 3 : 5. After 9 years, the proportion of their ages will be 3 : 4. Then the current age of Vaibhav is:

A) 10

B) 13

C) 15

D) 18

Answer: C) 15

Explanation:

Krish’s age = 3A and Vaibhav’s age = 5A

(3A+9)/(5A+9) = 3/4

=> 4 (3A + 9) = 3 (5A + 9)

=> A = 3

Therefore, Vaibhav’s age = 15 years.

Subject: Problems on Ages - Quantitative Aptitude - Arithmetic Ability

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Answer 2

Answer:

Option C) 15

Step-by-step explanation:

Let the age of Krish and Vaibhav are 3x and 5x.

3x plus 9 by 5x plus 9 = 3 by 4

3x=36-27

3x=9

x=3

so the age of vaibhav is 5x=5*3=15(c)