Answer: 78
Step-by-step explanation:
The rest of the answers are too small to be the length.
Let

. Then

, and so as

, you have

. The limit is then equivalent to
40 liters.....30% is yellow tint
0.30(40) = 12 liters are yellow
if u add 6 liters....(12 + 6) = 18 liters are now yellow...and since u added 6 liters, ur total mixture is now 46 liters.
18/46 = 0.39 = 39% <===
Answer: C
Step-by-step explanation: Hope this help :D