alleryযদি a : b = 3 : 4 এবং b : c = 5 : 7, তাহলে a : c হয়
A3 : 7
B15 : 28
C12 : 35
D21 : 20
Answer & Solution
Correct answer: B. 15 : 28
**সাধারণ b:** a : b = 15 : 20 (5 দ্বারা গুণ করুন)
b : c = 20 : 28 (4 দ্বারা গুণ করুন)।
**তাই একটি :** c = 15 : 28।
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