Q4Short answerExercise 3.4
The cost of 4 pens and 4 pencil boxes is Rs 100. Three times the cost of a pen is Rs 15 more than the cost of a pencil box. Form the pair of linear equations for the above situation. Find the cost of a pen and a pencil box.
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4x + 4y = 100,3x = y + 15, where Rs x and Rs y are the costs of a pen and a pencil box respectively; Rs 10, Rs 15