20. The cost of 2 pencils and 2 pens is Rs. 46whereas 3 pencils and 5 – InterviewSolution

1.	20. The cost of 2 pencils and 2 pens is Rs. 46whereas 3 pencils and 5 pens together cost Rs. 74.Find the cost of one pencil and that of one pen. OrThe sum of two numbers is 18 and their difference
Answer» Let pencil be X and pen be yhence2x+2y=46...3--6x+6y=1383x+5y=74....2----6x+10y=148subtract both4y=10y=2.5henceput in equation. 1x=20.5

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