exam Maths Puzzle Numerical Ability

A is 20 years older than B. He is also 6 times as old as B. find their ages.

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exam Other Question

Rewrite the middle term as the sum of two terms and then factor by grouping

x^2-14x+45
Solve the following:

3x-5y+2z=19
5x+2y-3z=-8
-2x+3y+5z=7