Question

Vimal purchased a few pens at Rs. 78 per dozen and again equal
number of similar pens at Rs. 80 per dozen. He sold all the pens at
Rs. 55 for 8 pens and earned Rs. 420. Find the total number of pens
purchased​

Answer 1

Answer:

Given total cost of 5 pens and 10 pencil = Rs 30

5 pens + 10 pencils = 30

pens + 2 pencils = 1

also given pen cost 3 more than a pencil

i.e, pen = 3 + pencil.

pen - pencil = 3

pens + 2 pencils = 6

_______________

-3 pencils = -3

pencils = 1

pen - 1 = 3

pen = 4

cost of pencils = 1    cost of pen = 4

Step-by-step explanation: