The average price of 6 books is Rs. 69 and the average price of other 3 books is Rs. 87. Find the average price of 9 books. a) Rs. 78 b) Rs. 75 c) Rs. 81 d) Rs. 72
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The average price of 6 books is Rs. 69 and the average price of other 3 books is Rs. 87. Find the average price of 9 books. a) Rs. 78 b) Rs. 75 c) Rs. 81 d) Rs. 72
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Answer:
b) Rs. 75
Step-by-step explanation:
The average price of 6 books is Rs. 69.
The total price of 6 books = Rs. 69×6= Rs. 414
The average price of 3 books is Rs. 87.
The total price of 3 books=Rs. 87×3= Rs. 261
The total price of 9 books= Rs. 414 + Rs. 261
= Rs. 675
The average price of 9 books= Rs. 675 ÷ 9
=Rs. 75(b)