book Maths Puzzle Numerical Ability

My mother is 35 years old
She is that age without counting the weekends each year
What is her real age!

Please Help !!
Thank You
xxx

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book Other Question

I would like to know how you would find a,b,c, on the special relationships.Like for ex. 8(times square root 3), 24, and 16( times square root 3). How would you find the answer 24. Your help would be greatly appreciated. A triangle has sides 2x-5, 3x+1, and 4x+2. What is the polynomial that represents the perimter? Is it 24x-10?