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A store sells an item for tk.1.50 each,or 3 item amounted to tk. 3.50. if 202 items were sold and revenue amounted to tk.279.00, how many of these items were sold one at a time?

A store sells an item for tk.1.50 each,or 3 item amounted to tk. 3.50. if 202 items were sold and revenue amounted to tk.279.00, how many of these items were sold one at a time? Correct Answer 130

let, number of item each price 1.50 is=xand number of item together 3 item price 3.50 = yso, x+3y = 202…………………(1)and        1.50x + 3.50y = 279or,    1.50X + 3.50(202-x)/3 = 279or,     4.50x + 707 - 3.50x = 837or,   x = 130

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