exam Maths Puzzle Numerical Ability

Please help.

Please Evaluate the following.

|-20|-|5|. My answer is 15. Is this correct.

Thanks
JMS

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exam Other Question

I need help please!!

Solve by adding like terms :

-3xy + 8xy^-1x^0 / y^-2 - 3x^2x^-1x / (x^-1)^-1

Thank u! Solve
-6(x + 3) - 10 = 3(-2x - 5) - 13