allery40 kg-এর একটি মিশ্রণে A, B, C, D-এর অনুপাত হলো 5 : 9 : 4 : 2। B-এর পরিমাণ হলো
A16 kg
B18 kg
C20 kg
D9 kg
Answer & Solution
Correct answer: B. 18 kg
20 ভাগের ওজন 40 kg, সুতরাং এক ভাগ হলো 2 kg এবং B হলো 9 x 2 = 18 kg।
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