Question 159571
The total volume is the same on both sides

1.80X+(20)(2.6)=(X+20)(2.12)

Use the distributive property
1.80X+52=2.12X+42.4

Subtract 1.8X from both sides
 52=0.32X+42.4

Subtract 42.4 from both sides

9.6=0.32X

X=30 L

Answer is A.

You can double check by replacing 30 for X