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Question

Q. Average cost of 7 pens and 5 books is Rs. 19. The average cost of 9 pens and 11 books is Rs. 23.80. What will be the total cost of 8 books and 8 pens?

Q. 7 पेन और 5 किताबों की औसत लागत 19 रुपये है। 9 पेन और 11 पुस्तकों की औसत लागत 23.8 रु है। 8 पुस्तकों और 8 पेन की कुल लागत क्या होगी?


A

325
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B

352
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C


333

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D

420
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Solution

The correct option is B
352

Total cost of 7 pens and 5 books = 12×19 = 228
Total cost of 9 pens and 11 books = 20×23.8
= 476
Adding both, we get that total cost of 16 books and 16 pens = 228+476
= Rs. 704
Total cost of 8 pens and 8 books
= Rs. 352

7 कलम और 5 पुस्तकों की कुल लागत = 12×19 = 228 9 +
कलम और 11 पुस्तकों की कुल लागत = 20×23.8 = 476
दोनों को जोड़ने पर, हमें कुल 16 किताबें और 16 पेन = 228 + 476 = रु. 704 8
पेन और 8 पुस्तकों की कुल लागत = रु. 352

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