Explanation:

- The ratio of the number of coins is given as 5:4:3:1 for 25 paise, 50 paise, Rs.2, and Rs.5 coins.

- Let the number of coins for 25 paise, 50 paise, Rs.2, and Rs.5 be 5x, 4x, 3x, and x, respectively.

- The total value in Rs:

- 25 paise coins: $5x\times 0.25=1.25x$

- 50 paise coins: $4x\times 0.5=2x$

- Rs.2 coins: $3x\times 2=6x$

- Rs.5 coins: $x\times 5=5x$

- The total equation is: $1.25x+2x+6x+5x=285$

- Simplify to get: $14.25x=285$

- Solving for x gives: $x=20$

- Number of 25 paise coins = 5x = 100

- Number of Rs.5 coins = x = 20

- Difference = 100 - 20 = 80

- The correct answer is Option 1: 80