300 = 30w - 60
300 = 60w - 30
300 = 30w + 60
300 = 30w
Source: বাংলাদেশ পেট্রোলিয়াম ইনস্টিটিউট (সহকারী পরিচালক) 18-12-2020
Answer: 300 = 30w + 60
Explanation:
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