Jen's and Lynn's savings were in the ratio of 4 : 9. Both of them shared the cost of their auntie's present equally. Jen's remaining savings was ²₅ as much as Lynn's savings. What percentage of her savings did Jen spend? Correct the answer to 1 decimal place.

	Jen	Lynn	Difference
Before	4x3 = 12 u	9x3 = 27 u	5x3 = 15 u
Change	- 2 u	- 2 u
After	2x5 = 10 u	5x5 = 25 u	3x5 = 15 u

Since Jen and Lynn shared the cost of their auntie's present equally, the amount each paid for the present is the same. 

So, the difference in the amounts between Jen and Lynn at first and in the end remains the same.  Make the difference in the amounts between Jen and Lynn at first and in the end the same. LCM of 5 and 3 is 15.

Amount that Jen spent on the present
= 12 u - 10 u
= 2 u

Percentage of her savings that Jen spent
= ²₁₂ x 100%
≈ 16.7%

Answer(s): 16.7%