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 ☺☺☺☺
PLUG in the numbers 4.5=500 x R x 2.5 divide both sides by 500 0.009=R x 2.5 divide 2.2 to both sides R=.0036 In percent you have to multiply by 100 which is 0.36%