Ayushi has 100 pens and pencils altogether. 20% of them are pens. She buys some more pens and the percentage of the pens increases to 50%. How many pens did she buy? A. 30 B. 50 C. 60 D. 80

The number of pens she bought is 30.

The first step is to determine the number of pens she has.

Number of pens she has = 20% x 100

= 0.2 x 100 = 20

The second step is to determine the number of pens she bought. This equation can be used to determine the

(x - 20) / 20 = 0.5

Where x is the number of pens she bought.

x - 20 = (0.5 x 20)

x - 20 = 10

x = 20 + 10

x = 30

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step-by-step explanation:

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