a : b =2:3 এবং b : c = 6:7 হয়, তবে a : c = কত ? 

A 2 : 6

B 3 : 7 

C 2 : 7

D 4 : 7 

Solution

Correct Answer: Option D

 a : b =2:3 =(2×2):(3×2)= 4:6   

 b : c = 6:7 

 ∴ a : b : c = 4:6:7

 সুতরাং a : c =4:7 

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