exam Maths Puzzle Numerical Ability

How do I solve by using two equations in two variables?

Larry is 8 years older than his sister. In 3 years, he will be twice as old as she is now. How old are they now?

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exam Other Question

I need to check my answer:

Solve the equation:
x/2x+2= -2x/4x+4 + 2x-3/x+1

Thank you again Find the reciprocal of (-1/5) (15). This is my last question. Reciprocal?? How do I figure that out i have no clue.