Question

There are 30 consecutive numbers what is the difference between the averages of first and last 10 numbers

Answer 1

$\frac{10x + 21 + 2 2 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{10} - \frac{10x + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10}{10}$
$2$