book Maths Puzzle Numerical Ability

Find the coordinates of the midpoint of a segment with each pair of endpoints.
K(1/4, 1), L(1/8, 0)

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book Other Question

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 The sum of two numbers is 21. When the larger number is subtracted from four times the smaller number, the difference is 4. What are the two numbers?