At a stationary shop, it costs Tk. 185 for 4 gel-pens, 8ball-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?

A Tk. 45

B Tk. 60

C Tk. 55

D Tk. 70

Solution

Correct Answer: Option C

এখানে ,

4G+8B+1M=185.......(i)
7G+15B+1M=315 (ii)

(ii)-(i)
  7G+15B+1M=315
  4G+8B+1M=185
_________________________
 3G+7B        =130

বা, 2(3G+7B)=130×2
বা,6B+14B=260

(ii)-(iii) বা,

7G+15B+1M=315
6G+14B        =260
____________________
1G+1B+1M=55

1 টি জেল পেন , 1 টি বল পেন ও 1 টি মার্কার পেনের একত্রে মূল্য 55 টাকা ।

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