John is starting a roofing business. he will need to buy a truck and some supplies to get the business going, the truck cost $13,000 used. the material for each job he completes cost $1000. if he spent 27,000 how much jobs did he complete?

John will only need to buy the truck once, so that is $13,000. 
27,000-13,000=14,000 
If each project costs 1,000, he can complete 14 jobs. 

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.