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21
You first of all divide 28 by 4 to get 7. This is one fourth of 28. Multiply the 7 by 3 to get 21 . 21 is three fourths of 28
You need to divide it by 6/7.
2x-21 = 7 Adding 21 in both sides will change 2x-21+21 = 7 + 21 into 2x = 28 Now divide both sides on 2 2x/2 = 28/2 then x = 14
Add all of the numbers, and divide the result by how many numbers there are.21 + 17 + 14 + 28 + 15 = 9595 / 5 = 19