The 3 numbers whose sum is 45 are in the ratio 1 : 3 : 5. Find those numbers

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Solution

Let the common factor be $x$
The ratio is $1 : 3 : 5$
The sum is $45$
So $x + 3 x + 5 x = 45 9 x = 45 x = \frac{45}{9} x = 5$
So the numbers are $x = 5 3 x = 15 5 x = 25$

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