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Problems on Ages Flashcards
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Formula
Simultaneous equations = ?
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Answer
Always form 2 equations for 2 unknowns — one from present condition, one from past/future condition.
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Formula
Key translation = ?
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Answer
'x years ago' means SUBTRACT x. 'x years hence' means ADD x. 'x times as old' means MULTIPLY.
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Formula
Sum of ages always increases by (number of people × years passed)...?
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Answer
Sum of ages always increases by (number of people × years passed). If 2 people, after 5 years sum increases by 10.
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