Tammy’s working alone could clean one and a half area in one hour her partner Melissa’s working alone could clean up 1/3 of the area in one hour during the contest when the work together how long will it take them to clean the area

Step-by-step explanation:

The basic principle in this type of problem is that work = rate times time or w = rt Tammy's rate is 1/2 of the job in 1 hour and Melissa's rate is 1/3 of the job in 1 hour. When the two of them work together, they both work the same amount of time which is t hours. Tammy's part of the job +Melissa's part of the job=1 complete job. (1/2)t + (1/3) t = 1Multiply both sides of the equation by the lowest common denominator which is 6 resulting in3t + 2t =5t = 6 t = 6/5 or 1 and 1/5 hour

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.