1. Three times a number added to twelve is 27. Find the number.
2. Twice the sum of a number and four is ten. Find the number.
3. Out of the 50 states, Hawaii has the least number of roadway miles, followed by Delaware. If
Delaware has 1931 more roadway miles than Hawaii and the total number of roadway miles for both states is 10,673, find the number of roadway miles for each state.
4. North and South Dakota both have over 80,000 roadway miles. North Dakota has 4489 more miles and the total number of roadway miles for both states is 169,197. Find the number of roadway miles for North Dakota and for South Dakota.