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The sum of cost of 5 eraser, 3 pencil an...

The sum of cost of 5 eraser, 3 pencil and 1 pan is Rs. 16. The sum of cost of 2 eraser, 1 pencil and 3 pen is Rs. 19. While the cost of 1 eraser, 2 pencil and 4 pen is Rs. 25. Find cost per unit of eraser, pencil and pen.

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