Question
The cost of 3 pens, 8 pencils,
and 12 erasers at a stationery shop is Rs 90. At the same shop, the cost of 5 pens and 8 erasers is Rs 45 more than 10 pencils. By how much amount (in Rs.) does the cost of 60 pencils and 3 erasers exceed the cost of 10 pens?Solution
ATQ,
Let the cost of a pen be x, a pencil be y, and an eraser be z. From the information: 
To find 60y+3z−10x: Combine (1) and (2), solve for the required expression, yielding the answer as Rs 75.
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