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A man left one-fourth of his estate to his wife, one-fifth to each of his two sons,
one-eight to his daughter and the remainder, an amount of $3,600 to charity.
Find the amount of estate.
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Let x be the amount of estate.
Then you write equation as you read the text
+ + + 3600 = x.
To solve it, mutiply all the terms by 40 to ride off the denominators.
10x + 16x + 5x + 3600*40 = 40x
144000 = 40x - 10x - 16x - 5x
144000 = 9x
x = 144000/9 = 16000.
ANSWER. The amount of estate was 16000 monetary units.
Solved and carefully explained.
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A key step in solving such problems is
to write an equation as you read the text.
MEMORIZE and USE this rule (!)
It is the engine which moves the entire solution.