exam Maths Puzzle Numerical Ability

Jeanne is three times as old as Michel. The sum of their ages is 20 years. Find out their age now.

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exam Other Question

How long must a guywire be to run from the top of an 18-ft pole to a point on level ground 16 ft away from the base of the pole? How many liters of a 60% salt solution must be added to 20 liters of a 12% salt solution to produce a 40% salt solution?