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.

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step-by-step explanation:

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step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse