By representing Donna's share as 7x, the second woman's share as 3x, and the third woman's share as 2x, and solving the equation, we find that Donna received £21 out of the total £36.
Let Donna's share be represented as 7x, the second woman's share as 3x, and the third woman's share as 2x. According to the given information, the total amount they earned is £36. The equation for this is:
7x + 3x + 2x = 36
Combine like terms:
12x = 36
Now, solve for x:
x = 36 / 12
x = 3
Now that we know the value of x, we can find Donna's share (which is 7x):
Donna's share = 7 * 3 = 21
Therefore, Donna received £21.