Question

find out the ratio between the cost of a pencil and that of a pen when pencil cost 24 per score and pen cost Rs. 16.80 per dozen

Answer 1

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Here is the solution:

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1 score = 20

1 dozen = 12

Find the cost of a pencil:

20 pencils = Rs 24

1 pencil = 24 ÷ 20 = Rs 1.20

Find the cost of a pen:

12 pens = Rs 16.80

1 pen = 16.80 ÷ 12 = Rs 1.40

Find the ratio:

Pencil : Pen = 1.2 : 1.4

Multiply by 10:

Pencil : Pen = 12: 14

Simplify by dividing by 2:

Pencil : Pen = 6 : 7

Answer: The ratio of pencil to pen is 6:7