Usha baked 80 wafers. ⁵₈ of the wafers were cherry wafers. The rest were butter cream wafers. She gave an equal number of cherry wafers and butter cream wafers away and had 2 times as many cherry wafers as butter cream wafers left. How many wafers did she give away?

	Cherry wafers	Butter cream wafers	Difference
Before	5x1 = 5 u	3x1 = 3 u	2x1 = 2 u
Change	- 1 u	- 1 u
After	2x2 = 4 u	1x2 = 2 u	1x2 = 2 u

Since Usha gave away an equal number of cherry wafers and butter cream wafers, the difference in the number of cherry wafers and butter cream wafers remains unchanged.  Make the difference in the cherry wafers and butter cream wafers the same.  LCM of 2 and 1 is 2.

Total number of wafers at first
= 5 u + 3 u
= 8 u

8 u = 80

1 u = 80 ÷ 8 = 10

Number of wafers that Usha gave away
= 1 u + 1 u
= 2 u
= 2 x 10 
= 20

Answer(s): 20