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

Having trouble on this. Any help is appreciated.

Square root of y+9 = 1 Please help me solve this problem:
Find an equation of the line containing the given point and having the given slope
(_3,0), m=-2