book Maths Puzzle Numerical Ability

when diving -15 / -5 is the answer a positive or negative number?
Is the reciprocal of 12 112 or -12 or -112?

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book Other Question

Divide the following fractions:

6p-18/9p divided by 3p-9/p^2+2p

Thank you THE ARE 20 STUDENTS AND THEY NEED TO BE ALLOCATED INTO 3 CLASSROOMS.IN HOW MANY WAYS CAN THIS BE DONE
1.ASSUMING THAT THE STUDENTS ARE IDENTICAL
2.ASSUMING THAT THE STUDENTS ARE DISTINGUISHABLE