The total cost of 15 books and 12 pens is $202.50 , the average cost of the 12 pens is $3.50 , what is the average cost of the 15 books?
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total cost of 15 books and 12 pen is 202.50
Therefore, Total cost = 15B + 12P
Average of 12 P is given as 3.50
Means cost of 12P is 3.50 x 12 = 42
total cost = 15B + 42
202.50 = 15B + 42,
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15b = 160.50 Rs
this is the total cost of 15 books
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average of 15 b is 160.50 /15 is 10.70
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