exam Maths Puzzle Numerical Ability

tell whether this is always never or sometimes true

the sum of two consecutive even numbers equals the sum of two consecutive odd numbers

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exam Other Question

X-.20X=1400 Describe and correct the input error in the following table. The output is correct:

input,x: 1, 3, 1, -3
output,y: -1, 4, 1, 5