In a bag, there are coins of 25P, 10P and 5P in the ratio of 1 : 2 : 3. . If there is Rs.36 in all, how  many 5 P coins are there

Let the coins are 25P, 10P and 5P in x, 2x, and 3x

So, $x\times \frac{25}{100}+2x\times \frac{10}{100}+3x\times \frac{5}{100}=36$

$\frac{25x+20x+15x}{100}=36$

$\frac{60x}{100}=36$

$x=\frac{36\times 100}{60}$

x = 60

5 p coins = 3x

= 180 coins