The cost of a notebook twice that of a pen.
If you can buy 5 notebooks, how many pens can you by with the same money.

5

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7

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10

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3

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Solution

The correct option is B $10$
Let cost of a notebook is y
Cost of a pen is x
then y=2x
cost of 5 notebooks = 5y
cost of a pen = x
No. of pen one can buy with 5y money = $= \frac{5 y}{x} = \frac{5 x \times 2 x}{x} = 10$

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The cost of a notebook twice that of a pen.If you can buy 5 notebooks, how many pens can you by with the same money.

The correct option is B 10Let cost of a notebook is yCost of a pen is xthen y=2xcost of 5 notebooks = 5ycost of a pen = xNo. of pen one can buy with 5y money = =5yx=5x×2xx=10

The cost of a notebook twice that of a pen.
If you can buy 5 notebooks, how many pens can you by with the same money.

The correct option is B $10$
Let cost of a notebook is y
Cost of a pen is x
then y=2x
cost of 5 notebooks = 5y
cost of a pen = x
No. of pen one can buy with 5y money = $= \frac{5 y}{x} = \frac{5 x \times 2 x}{x} = 10$