Two sums of money are proportional to 8:9.n if the first is 20/- the other is

9/8 * 20 = 180/8 = 22.5

I do not understand why you inserted
.n" and "/-" into your question. The word "if" should be capitalized since it appears to start a sentence.

8/9=20/x

8x=20*9

8x=180 Divide with 8

x=180/8

x=(2*2*45)/(2*2*2)=45/2=22.5

To find the second sum of money, we can set up a proportion using the given ratio:

Let's represent the first sum of money as x and the second sum of money as y.

According to the given information, the ratio of the two sums of money is 8:9, which can be written as:

x/y = 8/9

Now, substitute the value of the first sum of money:

20/y = 8/9

To solve for y, cross-multiply:

8y = 20 * 9

8y = 180

Divide both sides of the equation by 8 to find y:

y = 180 / 8

y = 22.5

Therefore, the second sum of money is Rs. 22.50.