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The ratio of the given two numbers is 9 ...

The ratio of the given two numbers is 9 : 7. If 6 is added to each number, then the ratio becomes 21 : 17. What is the difference between the given numbers ?
दी गयी दो संख्याओं का अनुपात 9:7 है | यदि प्रत्येक संख्या में 6 जोड़कर उसे बढ़ा दिया जाए तो अनुपात 21:17 हो जाता है | दी गयी दो संख्याओं के बीच क्या अंतर है?

A

a)4

B

b)16

C

c)8

D

d)12

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