exam Maths Puzzle Numerical Ability

Marie is one-ninth as old as her mother. In three years,
she will be one-forth as old as her mother will be then.
Find their present ages.

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exam Other Question

In a set of 200 numbers, how many will lie within 2 standard deviations of the mean? determine whether the graphs of the equations are parallel, perpendicular, or neither.
12.3y+2x=6
y=7-3x
13.2x-4y=3
3x-6y=8
14.y+x=5
x-y=-4