Question
If the cost of 4 pens and 6 note books is ₹ 800, then
find the cost of 6 pens and 9 note books.Solution
4pen +6notebook =800 2(2pen+3notebook) =800 (2pen+3notebook) =400 … (1) Then Equation (1) multiply by 3. 6pen+9notebook=1200.
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