Question
The cost of 2 pencils, 4 pens, and 8 erasers is Rs. 12
and the cost of 8 pens, 10 pencils, and 4 erasers is Rs. 36. How much will 3 pencils, 3 pens, and 3 erasers cost?Solution
2 pencils+ 4 pens + 8 erasers =12           … (1) 10 pencils+8 pens+4 erasers =36            … (2) Adding Eq (1) and (2) … 12pencils +12 pens +12 erasers =36+12=48 12(1 pencil +1 pen +1 eraser) =48 (1 pencil +1 pen +1 eraser) =4 (3 pencil +3 pen +3 eraser) =4×3=12 (3 pencil +3 pen +3 eraser) =12.
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