exam Maths Puzzle Numerical Ability

what is the difference between -17 and -5 please help is it 12 or -12???

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exam Other Question

divide

x2 - 9x + 20 ÷ x2 - 25
------------ ÷ ---------
6x - 4 ÷ 2x + 10

I am totaly stumped, please help!!!
A man engaged a servant for 40 days on the condition that he would pay him Rs.20 for each day he works and would fine him Rs.10 for each absence. At the end of 40 days the servant