Gem baked 140 biscuits. ³₅ of the biscuits were strawberry biscuits. The rest were mango biscuits. She gave an equal number of strawberry biscuits and mango biscuits away and had 5 times as many strawberry biscuits as mango biscuits left. How many biscuits did she give away?

	Strawberry biscuits	Mango biscuits	Difference
Before	3x4 = 12 u	2x4 = 8 u	1x4 = 4 u
Change	- 7 u	- 7 u
After	5x1 = 5 u	1x1 = 1 u	4x1 = 4 u

Since Gem gave away an equal number of strawberry biscuits and mango biscuits, the difference in the number of strawberry biscuits and mango biscuits remains unchanged.  Make the difference in the strawberry biscuits and mango biscuits the same.  LCM of 1 and 4 is 4.

Total number of biscuits at first
= 12 u + 8 u
= 20 u

20 u = 140

1 u = 140 ÷ 20 = 7

Number of biscuits that Gem gave away
= 7 u + 7 u
= 14 u
= 14 x 7 
= 98

Answer(s): 98