Question

£9.00 is shared between Amanda, Anita and Claire in the ratio of 8:5:2

Answer 1

Well, since the ratio is 8:5:2 you need 8 bits, then 5 bits then 2 bits. So 8+5+2=15, 9.00÷15=0.60, so 0.60=1 bit.
So for Amanda 0.60×8=4.80; for Anita 0.60×5=3.00 and for Claire 0.60×2=1.20
Amanda gets £4.80; Anita gets £3.00 and Claire gets £1.20.

To check your answer you add the money that was given to each individual together and if it equals the initial £9.00, then your answer is correct, you can also check this by seeing who has the most money, the person with the highest number should have the highest amount of money. 

Answer 2

£9.00 is shared between Amanda, Anita and Claire in the ratio of 8:5:2
Amanda receives 9*(8/(8+5+2)) = 9*8/15 = £4.8
Anita receives 9*(5/(8+5+2)) = 9*5/15 = £3
Claire receives 9*(2/(8+5+2)) = 9*2/15 = £1.2