৩০ লিটার মিশ্রণে এসিড ও পানির অনুপাত ৭: ৩। ঐ মিশ্রণে কী পরিমাণ পানি মেশালে এসিড ও পানির অনুপাত ৩ : ৭ হবে?
A. 40
B. 35
C. 30
D. 25
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সঠিক উত্তরঃ
A.
40
Explanation:
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