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Direct Proportions

If 9 pens cos...

Question

If 9 pens cost ₹72, a dozen of them will cost _________.

A

86

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B

90

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C

96

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D

100

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Solution

The correct option is C 96

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Q. Three shopkeepers A, B and C go to a store to buy stationary. A purchases 12 dozen notebooks, 5 dozen pens and 6 dozen pencils. B purchases 10 dozen notebooks, 6 dozen pens and 7 dozen pencils. C purchases 11 dozen notebooks, 13 dozen pens and 8 dozen pencils. A notebook costs 40 paise, a pen costs Rs. 1.25 and a pencil costs 35 paise. Use matrix multiplication to calculate each individual's bill.

Question 12

Cost of a dozen pens is Rs 180 and cost of 8 ball pens is Rs 56. Find the ratio of the cost of a pen to the cost of a ball pen.

Q. 3 persons A,B,C go to stationary shop and If person A buying 10 dozen notebooks and 4 dozen pen and 5 dozen pencil and person B purchase 8 dozen notebook, 6 dozen pens and 7 dozen pencil, and person C purchase 10 dozen notebook, 5 dozen pen and 11 dozen pencil. A note book cost Rs.3, A pen cost Rs.2 and pencil cost Rs.1, by using matrix multiplication to calculate each individual will.

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