৩, ৯, ও ৪ এর চতুর্থ সমানুপাতিক কত? 

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A

৪ 

B

১৪ 

C

১৬ 

D

১২

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Updated: 4 weeks ago

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B

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D

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A mixture contains copper, zinc, and tin in the ratio 2 : 3 : 5. If the total weight of the mixture is 50 grams, how many grams of tin are there in the mixture?

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A

20 grams

B

15 grams

C

10 grams

D

25 grams

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A certain principal amount, invested at simple interest, grows to Tk. 815 after 3 years and Tk. 854 after 4 years. What is the original principal amount?

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A

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B

Tk. 612

C

Tk. 698

D

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