Pamela's and Betty's savings were in the ratio of 4 : 9. Both of them shared the cost of their younger brother's present equally. Pamela's remaining savings was ¹₃ as much as Betty's savings. What percentage of her savings did Pamela spend? Correct the answer to 1 decimal place.

	Pamela	Betty	Difference
Before	4x2 = 8 u	9x2 = 18 u	5x2 = 10 u
Change	- 3 u	- 3 u
After	1x5 = 5 u	3x5 = 15 u	2x5 = 10 u

Since Pamela and Betty shared the cost of their younger brother's present equally, the amount each paid for the present is the same. 

So, the difference in the amounts between Pamela and Betty at first and in the end remains the same.  Make the difference in the amounts between Pamela and Betty at first and in the end the same. LCM of 5 and 2 is 10.

Amount that Pamela spent on the present
= 8 u - 5 u
= 3 u

Percentage of her savings that Pamela spent
= ³₈ x 100%
≈ 37.5%

Answer(s): 37.5%