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Question

Q. The age of Ravi 10 years ago was thrice the age of Kiran. Ten years hence, Ravi’s age will be twice that of Kiran. The ratio of their present ages is:

Q. 10 साल पहले रवि की उम्र किरण की उम्र से तीन गुनी थी।दस साल बाद, रवि की उम्र किरण की तुलना में दोगुनी होगी।उनकी वर्तमान उम्र का अनुपात है:

A

7:3
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B

5
3:5
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C

17
9:17
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D

7
2:7
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Solution

The correct option is A
7:3
Let the age of Ravi and Kiran 10 years ago be 3x and x respectively.
Then, (3x+10)+10=2((x+10)+10)
3x+20=2x+40
Thus, x=20
Ratio of their present ages =(3x+10):(x+10)=70:30=7:3

माना कि रवि और किरण की आयु 10 साल पहले क्रमशः 3x और x थी।
फिर, (3x+10)+10=2((x+10)+10)
3x+20=2x+40
इस प्रकार,x=20
उनकी वर्तमान आयु का अनुपात=(3x+10):(x+10)=70:30=7:3

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