exam Maths Puzzle Numerical Ability

x+3y+5z-4w=1
X+3y+z-2w+v=-1
x-2y+z-w-v=3
x-4y+z+w-v=3
x+2y+z-w+v=-1

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exam Other Question

How can the mode give an idea of what the mean might be?
a.it would be the same as the mean
b. a high frequency of numbers
c. it would be close to the mean
d. the mode and the Solve for the unknown: 8/52 = m/39

I have no clue about these at all HELP.