Three Variables Two Equation : MATHS BY AMIYA

1. If Cost of 3 pens, 5 erasers and 2 books is Rs 300; and 4 pens, 3 erasers and 4 books is RS 400 then what is the cost of 2 pens and 7 erasers ?

2. If Cost of 2 pens, 3 erasers and 1 books is Rs 100; and 1 pens, 1 erasers and 2 books is RS 300 then what is the cost of 5 pens, 7 erasers and 4 books?

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