Mrs Chew gave Fanny and Sabrina some money each on Monday. On Tuesday, Fanny gave ¹₄ of the amount she had to Sabrina. On Wednesday, Sabrina gave ¹₆ of the amount she had to Fanny. In the end, Fanny had $37 and Sabrina had $35. How much did Sabrina had more than Fanny at first?

	Fanny	Sabrina	Total
Before 1	4 u	?	$72
Change 1	- 1 u	+ 1 u
After 1	3 u	6 p	$72
Before 2	$37 - 1 p	6 p	$72
Change 2	+ 1 p	- 1 p
After 2	$37	5 p ($35)	$72

Amount that Sabrina had in the end = 5 p

5 p = 35

1 p = 35 ÷ 5 = 7

Working backwards.

Amount that Fanny had after giving to Sabrina on Tuesday
= 37 - 1 p
= 37 - 7
= $30

3 u = 30

1 u = 30 ÷ 3 = 10

Amount that Fanny had at first
= 4 u
= 4 x 10
= $40

Total amount that Fanny and Sabrina had 
= 37 + 35
= $72

Amount that Sabrina had at first
= 72 - 40
= $32

Amount that Fanny had more than Sabrina
= 40 - 32 
= $8

Answer(s): $8