Angles in a 4-sided shape = 360 degrees
2x + x + 101 + 85 = 360
3x + 186 = 360
3x = 174
x = 58 degrees
1 gallon equals to 3.79 litres approximately
so 2 gallons=7.58 litres , therefore 8 litres are greater than 2 gallons
511 divided by 7 is the unit rate. So a is how you get it but d is the answer
