Fiona's and Gillian's savings were in the ratio of 4 : 9. Both of them shared the cost of their older sister's present equally. Fiona's remaining savings was ¹₅ as much as Gillian's savings. What percentage of her savings did Gillian spend? Correct the answer to 1 decimal place.

	Fiona	Gillian	Difference
Before	4x4 = 16 u	9x4 = 36 u	5x4 = 20 u
Change	- 11 u	- 11 u
After	1x5 = 5 u	5x5 = 25 u	4x5 = 20 u

Since Fiona and Gillian shared the cost of their older sister's present equally, the amount each paid for the present is the same. 

So, the difference in the amounts between Fiona and Gillian at first and in the end remains the same.  Make the difference in the amounts between Fiona and Gillian at first and in the end the same. LCM of 5 and 4 is 20.

Amount that Gillian spent on the present
= 36 u - 25 u
= 11 u

Percentage of her savings that Gillian spent
= ¹¹₃₆ x 100%
≈ 30.6%

Answer(s): 30.6%