Marion baked 50 biscuits. ³₅ of the biscuits were peach biscuits. The rest were cherry biscuits. She gave an equal number of peach biscuits and cherry biscuits away and had 3 times as many peach biscuits as cherry biscuits left. How many biscuits did she give away?

	Peach biscuits	Cherry biscuits	Difference
Before	3x2 = 6 u	2x2 = 4 u	1x2 = 2 u
Change	- 3 u	- 3 u
After	3x1 = 3 u	1x1 = 1 u	2x1 = 2 u

Since Marion gave away an equal number of peach biscuits and cherry biscuits, the difference in the number of peach biscuits and cherry biscuits remains unchanged.  Make the difference in the peach biscuits and cherry biscuits the same.  LCM of 1 and 2 is 2.

Total number of biscuits at first
= 6 u + 4 u
= 10 u

10 u = 50

1 u = 50 ÷ 10 = 5

Number of biscuits that Marion gave away
= 3 u + 3 u
= 6 u
= 6 x 5 
= 30

Answer(s): 30