The gcf of 18 and 27 can be obtained like this: The factors of 18 are 18, 9, 6, 3, 2, 1. The factors of 27 are 27, 9, 3, 1. The common factors of 18 and 27 are 9, 3, 1, intersecting the two sets above.
For the GCF, you want to perform the title backwards. Write Factors of the numbers, find the Common ones and then the Greatest of those. *It is good to write the factors in pairs to ensure none are left out
Let n be the amount of time it takes william to cut the lawn. Then Shelly takes n-2 hours. So: 1/n+1/n-2=1/3 3(n-2)+3n=n²-2n 6n-6=n²-2n n²-8n+6=0 Using the quadratic formula, we get a positive value of 7.1623 hrs as the amount of time william takes working alone, and 5.1623 as the amount of time Shelly takes working alone ☺☺☺☺
