Answer: 5/8
Step-by-step explanation:
This fraction is talking about a whole, so 3/8 + x = 1.
Knowing this, we just do 1 - 3/8, which is 5/8.
I need more details so I can help you.
I do suppose that you refer to adding these quantities:
6/1 + 21 = 6 + 21 = 27
<span>and
6/10 + 21
</span>= 3/5 + 21
= 3/5 + 105/5
= 108/5