The cost of 8 gel pens and 14 ball pens is 94. what will be cost of 36 gel pens and 63 ball pens (in rs.)?
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8g+14b=94......................(1)
multiplying 9/2
36g+63b=9*94/2=423
multiplying 9/2
36g+63b=9*94/2=423
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