a : b = 4 : 7 এবং b : c = 5 : 6 হলে, a : b : c = কত?
A 4:7:6
B 20:35:24
C 20:35:42
D 24:35:30
Correct Answer: Option C
a:b=4:7=(4x5):(7×5)=20:35
b:c=5:6=(5×7):(6x7)=35:42
a:b:C=20:35:42
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