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Find the number which when multiplied by 7 is increased by 78.
Given :
The number which when multiplied by 7 is increased by 78.
To do :
We have to find the number.
Solution :
Let the number be x.
$7x = x+78$
$7x-x = 78$
$6x = 78$
$x = \frac{78}{6}$
$x = 13$.
Therefore, the number is 13.
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