Gabby's and Abi's savings were in the ratio of 2 : 7. Both of them shared the cost of their grandmother's gift equally. Gabby's remaining savings was ¹₅ as much as Abi's savings. What percentage of her savings did Abi spend? Correct the answer to 1 decimal place.

	Gabby	Abi	Difference
Before	2x4 = 8 u	7x4 = 28 u	5x4 = 20 u
Change	- 3 u	- 3 u
After	1x5 = 5 u	5x5 = 25 u	4x5 = 20 u

Since Gabby and Abi shared the cost of their grandmother's gift equally, the amount each paid for the gift is the same. 

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

Amount that Abi spent on the gift
= 28 u - 25 u
= 3 u

Percentage of her savings that Abi spent
= ³₂₈ x 100%
≈ 10.7%

Answer(s): 10.7%