3. A doctor treated 2,000 patients over a period of time. If he worked for<br />5 hours a day and spent 15 minutes pach patient, how many days<br />did the doctor spend to treat all the patients?

100 days

Step-by-step explanation:

The doctor treated 2000 patients

He worked for 5 hrs a day and,

Spent 15 minutes per patient

1 patient takes 15 minutes

In 5 hrs he treats;

300/15 = 20 patients

In one day he treats 20 patients

We are to find the number of days he treats 2000 patients.

Cross multiplying gives;

2000/20 = 100 days

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

27 +27 or 27times 2=54

the diffrence is 0