a : b = 4 : 7, b : c = 5 : 6 হলে a : b : c কত?

A 4 : 7 : 5

B 4 : 7 : 6

C 20 : 35 : 42

D 20 : 44 : 35

Solution

Correct Answer: Option C

a ⦂ b = 4 ⦂ 7
         =20 ⦂  35
b ⦂ c  =5 ⦂ 6
          =35  ⦂ 42
∴a ⦂ b ⦂ c= 20 ⦂ 35 ⦂ 42

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