Question 1152317
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<pre>

Let x be the number of days.


Then you have this equation


   230x + 240 = 190x + 720.


From the equation


    230x - 190x = 720 - 240 

    40x         = 480

      x         = 480/40 = 12 days.    <U>ANSWER</U>
</pre>

Solved.