alleryযদি a : b = 3 : 4 আৰু b : c = 5 : 7 হয়, তেন্তে a : c হ’ব
A3 : 7
B15 : 28
C12 : 35
D21 : 20
Answer & Solution
Correct answer: B. 15 : 28
**সাধাৰণ b:** a : b = 15 : 20 (5 ৰে গুণ কৰা)
b : c = 20 : 28 (4 ৰে গুণ কৰা)।
**গতিকে এটা :** c = 15 : 28।
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