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?
Created: 1 year ago |
Updated: 2 months ago
best des
Let,
price of gel-pen, ball-pen, and marker-pen are respectively x,y,z
First 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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