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At a stationary shop, it costs Tk. 185 for 4 gel-pen, 8 ball -point pens and 1 marker pen and Tk. 315 for 7 gel-pens, 15 ball point pens and 1 marker pen. What would be the cost of 1 gel-pen, 1 ball -point pen and 1 marker pen?

Correct Answer: Tk. 55
Let, price of gel-pen, ball-pen, and marker-pen are respectively x,y,zFirst case,4x+8y+z=185…………..(1)2nd case,7x+15y+z=315…………..(2)eq. (2)-(1)>>3x+7y=130………………..(3)Now eq. (2)-(3)*2 >>1x+1y+1z=315-260=55   ans 55 

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