a man sold 10 eggs for rs.5 and gained 20% how many eggs did he buy for 5 rupees

 Sp of 10 eggs is Rs 5

x + 20x  / 100 = 5

6x / 5 = 5

x = 25 / 6

Actual CP of 10 eggs was Rs 25 / 6

1 rupee = 10 / 25 / 6

12 / 5

5 ruppe = 12 / 5 * 5

= 12

Ans: 12 eggs