Find all the perfect numbers between 20 and 30

A perfect number is a natural number whose factors add to the original number.

6 is a good example of this, as 6 = 1 + 2 + 3.

The perfect number between 20 and 30 is 28: 28 = 1 + 2 + 4 + 7 + 14.

-Hope this helped! :D

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl