A man buys eggs at the rate of Tk. 7.2 per dozen eggs and sells them at taka 70 per 100 eggs. If his profit is Tk. 30, how many eggs did he buy?

120

180

200

300

None of these

Description (বিবরণ) :

প্রশ্ন: A man buys eggs at the rate of Tk. 7.2 per dozen eggs and sells them at taka 70 per 100 eggs. If his profit is Tk. 30, how many eggs did he buy?

ব্যাখ্যা:

Let the number of eggs he bought be D.

Buying price per egg = 7.2/12

Selling price per egg = 70/100

So,   70D/100 - 7.2D/12 = 30

or,   7D/10 - 7.2D/12 = 30

or, (42D - 36D) / 60 = 30

or,  6D = 60 x 30

or, D = 1800 / 6 =  300.

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3 : 2

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A man buys some shirts and some ties. Shirts cost Tk.70 each and the ties cost Tk. 30 each. If the man spends exactly Tk. 810 and buys the maximum number of shirts possible under these conditions, what is the ratio of shirts to ties?

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