book Maths Puzzle Numerical Ability

find the probabilty that at random a brunete that wants afternoon classes from the chart below.

Morning- Blonde(5) Brunette(25) Red(30)
Afternoon Blonde(35)Brunette(15) Re

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book Other Question
What is the quadratic equation for:
The sum of the squares of two consecutive positive integers is 85. Find the coordinates of the midpoint of a segment with each pair of endpoints.
K(1/4, 1), L(1/8, 0)