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Maths Puzzle
Numerical Ability
Dorothy is 3 times as old as her sister. In 5 years she will be twice as old as her sister. How old are Dorothy and her sister now?
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book Other Question
Could someone help me with this one also please?
Solve for x without using decimals:
(2x + 3)^2 - (x - 2)^2 = 3
b^3+2b^2=35b