Question

I don't know this question plz solve it
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Answer 1

Cost of each pen= Total cost of pens/No.of pens

=> 450/60= Rs 7.5

Cost of 30 pens= 7.5*30

= Rs 225

Original selling price of 5 pens= Cost of each pens* 5

=> 7.5*5

=> Rs 37.5

Loss found= Original selling price of 30 pens- Cost of 5 pens

=> 225-37.5

=> Rs 187.5

So, The new selling price is = 187.5/30= Rs 6.25............

Answer 2

cost of each pen = 450/60= 7.5

eq is -

30 (7.5 - x) - 5x = 0

225 - 30x = 5x

225/35 = x

x = 6.4285

x = 6.43 approx