Answer:
35 (the sequence is 1,2,18,19,35)
Step-by-step explanation:
So you have 5 numbers a, b, 18, c, d ordered from low to high.
18 is given because it is the median.
If the mean is 15, the sum must be 75 (because 75/5=15).
d must be as high as possible, so the others must be as low as possible, but positive and different.
So let's say a=1 and b=2, we can't get any lower than that.
c can be no lower than 19, otherwise we'd lose the median.
That leaves for d = 75 - 19-18-2-1 = 35.
nice one
