Answer :

Let the number of pens be x.

Total no. of things bought = 108

number of pencils = 108 – x

Cost of one pen = Rs 7

cost of x pens = 7x

Cost of 1 pencil = Rs 3

cost of (108 – x) pencils = 3(108 – x)

According to the question

7x + 3(108 – x) = 564

7x + 324 – 3x = 564

4x + 324 = 564

4x = 564 – 324

x = 60

So,

Number of pens = 60

Number of pencils = 108 – x = 108 – 60 = 48.

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