Respuesta :

Bubba
21.6

  x          13
----    =  ------
100        60

60x = 1300
x = 21.666

Check for reasonableness.....
We know that 15 minutes is a quarter of an hour or 25%.
And, 13 minutes (at 21.6%) is a little less than 15 minutes
(at 25%).

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good job