At a restaurant ,the price for 3 sandwiches and 2 cups of soup is 70.40 taka .Again ,price for 3 cups of soup and 2 sandwiches is 61.60 taka .How much does one sandwich cost (in taka )?

A 17.60

B 13.20

C 9.40

D 8.80

Solution

Correct Answer: Option A

মনে করি ,
        1 টি sandwiches এর মূল্য =x টাকা
এবং 1 কাপ soup          "      "  =y টাকা
প্রশ্নমতে , 3x+2y=70.40............(i)
          এবং2x+3y=61.60........(ii)
(i)×3-(ii)×2
             9x+6y=211.2
            4x +6y=123.2
          ________________________
            5x        =88
        বা, x=17.60
অতএব ,1 টি sandwiches এর মূল্য =17.60 টাকা

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