In Rohan's birthday party, 90% of his friends came and three friends did not come. Find the total number of friends Rohan has.(7th class math)

In Rohan's birthday party, 90% of his friends came and three friends did not come. Find the total number of friends Rohan has.

Solution:Given,friends came = 90%

                not came = 100 - 90 =10%

number of friends did not come = 3

Let the total number of friends = X

then,10% x X = 3

    10/100 x X = 3

                     X = _3 x 100_

                                 10

                     X = 30 friends

Therefore the total no.of friends 30.