exam Maths Puzzle Numerical Ability

EVALUATE EACH EXPRESSION: 7P3

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A chemist mixed a 20% acid solution with a 60% acid solution to make 10 L of a 30% solution. How many liters of the 60% solution were used? Anu chooses a diagonal from a regular 8 sided polygon. Anitha chooses another diagonal from the same polygon. What is the probability that they choose 2 diagonals of the same leng