# A certain whole number has the property that appending a digit 5 has the effect of adding 3074. What is the original number?

A certain whole number has the property that appending a digit 5 has the effect of adding 3074. What is the original number?
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Everett Mclaughlin
If the original number is n, then the number formed by tacking a 5 on the end is 10n+5
So:
$10n+5=n+3074$
Subtract n+5 from both sides to get:
$9n=3069$
Divide both sides by 9 to get:
$n=341$