Prove that the sum of three consecutive numbers is three times larger than the middle number.
+37091 Make the MIDDLE number 'x'
then the number BEFORE it is 'x-1'
and the number AFTER it is 'x+1'
add them together to see if they equal 3 * x (three times the middle number)
(x-1) + x + (x+1) = ? 3x ?
x-1+x+x-1 =? 3x
x+x+x = ? 3x
3x = 3x Proof!
