exam Maths Puzzle Numerical Ability

Find the length of AB if AC has lenghth 5 1/3 and BC has length 2 1/4.

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exam Other Question

How many liters of a solution containing 22% sugar and how many liters of another solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27% sugar? Does the systems {2x=5y=6 have a unique solution, no solution or many
{x=2.5y=3
solutions? What does this mean graphically?