A 4 : 7 : 6
B 20 : 35 : 24
C 20 :35 : 42
D 24 : 35 : 30
Correct Answer: Option C
a:b=4:7=20:35 [ 5 দ্বারা গুণ করে ] b:c= 5:6= 35:42 [ 7 দ্বারা গুণ করে ]
a:b:c= 20:35:42
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