exam Maths Puzzle Numerical Ability

if a square has the area 10cm^2,what is the length of a side

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exam Other Question

For moving purposes, the Hendersons bought 25 card board boxes for $97.50. There were two kinds of boxes; the large ones cost $ 7.50 per box, and the small ones cost $3 per box. HOw many boxes of each kind did they buy? please factor as a difference of squares:

m^2-n^2-2m+1