The mean of Greg’s journey times to work on 3 days was 28 minutes. If it took him 27 minutes and 25 minutes on two of the days, how long did it take him on the third day?

32

Step-by-step explanation:

In order to work out the mean, we add all the values together and then divide by how many values we had. In this case we had

(27 + 25 + x)/3 = 28

To work out what the third day (x) was, we must work backwards and do the opposite.

If finding the mean was adding then dividing, to find the value, we must multiply and then subtract.

Instead of diving by 3, we multiply by 3

28 x 3 = 84

Next we subtract the two values we already have, from 84

84 - 27 = 57

57 - 25 = 32 minutes

On the third day, Greg took 32 minutes to get to work.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.