exam Maths Puzzle Numerical Ability

Peter received commissions of $150 and $225. How much be receive from a third sale so his total commission will exceed $500?

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exam Other Question

this is a multiplacation problem ,can you teel me if this is correct ,if not can you show me the right way
(3m-2n)
(3m)*(-2n^2 )
3*m*2*n^2
-6*m*n^2 How do you solve this:

m2 + n2/m2-n2 + m/n-m + n/m+n