exam Maths Puzzle Numerical Ability

(-9)(5)
________
-3
This is supposed to be a fraction and I have no idea how to do this. Can someone please help.

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exam Other Question

How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound? 10*sq rt 7 + 8*sq rt 7 = what?