Lena has some eggs. she uses 3/5 of the eggs to make waffles and scrambled eggs. she uses 2/3 of the eggs she took to make waffles. what fraction of the total number of eggs does lena use to make waffles?

3. 9
--- • 3 = ---
5. 15

2. 10
--- • 5 = ---
3. 15

19/15 or 1 4/15

Okay, so first you do 3/5 + 2/3. The least common denominatior of 5 and 3 is 15.
5x3=15 so, 3x3 = 9 So, 3/5 = 9/15
3x5=15 so, 2x5 = 10 So, 2/3 = 10/15
10/15 + 9/15 = 19/15. 
19/15 = 1 4/15
Hope I helped. Sorry I'm giving you an answer pretty late, but I just saw this.