exam Maths Puzzle Numerical Ability

shimaran is twice as ols as her son.in four years she will be four times as old as her son was 9 years ago. how old is each now

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exam Other Question

Simplyfy equation

((1/x)/(2/x)-(1/(1-x)))
Could someone please help me with the following problem:

Solve using matrices:

x + 2y -z =2
2x -2y + z =-1
6x +4y =3Z = 5

Thank You
RF