alleryজিঙ্ক ও তামার একটি সংকর ধাতুতে এদের অনুপাত 5 : 3। এর 40 kg-তে কতটা জিঙ্ক আছে?
A15 kg
B25 kg
C30 kg
D20 kg
Answer & Solution
Correct answer: B. 25 kg
সংকর ধাতুটির 5/8 অংশ হলো জিঙ্ক, এবং 40 kg-এর 5/8 অংশ হলো 25 kg।
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