If 12a + 3b =1 and 7b-2a=9, what is the average of a and b?
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If m And p are positive integers and ( m + p ) m is even , which of the following must be true ?

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A trader marked the price of a article 30% above the cost price and gave the buyes 10& discount on market price, thereby gaining Tk. 340. The cost of the article is?

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