book Maths Puzzle Numerical Ability

Phil and Phyllis are siblings. Phyllis has twice as many brothers as she has sisters. Phil has the same number of brothers as sisters. How many girls and how many boys are in the family?
I dont even know where to start with this one.

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book Other Question

I need to Simplify and express in simplest radical form.

How would I simplify

(square root of 2 -3)(square root of 2 + 3)
Would I multiply to get

4 square root of -9

which would be

4 * -3

Answer -12
Carl and Lisa have decided to refinance their home mortgage loan. Their current home mortgage loan is for $939,000. The mortgage interest rate is 4.25% and it is to be paid off in