. . . like Samantha's here, from Hamlin.
I knew that to find the mean, you add up the numbers, and divide by the quantity of numbers.
If the first two numbers had a mean of four, then they had to add up to eight, because eight divided by two is four.
If the first three numbers had a mean of nine, they had to add up to 27 because 27/3 is 9.
The third number then had to be 19, because 27 - 8 = 19
The sum of the four numbers had to be 60, since 60/4 = 15.
The third number had to be 33 because 60 - 27 = 33.If one of the numbers is 2, and the sum of the first two numbers is eight, then the second number must be 6.
The answer to the problem is 2, 6, 19, 33.
Easy really! Well done Samantha.