Ur basically looking for the common multiple of the numbers 8,9,12,and 15.
LCM of these numbers is 360.
so 360 minutes = (360/60) = 6 hrs
and 6 hrs from 3 p.m. would be : 9 p.m. <== ur answer
Can you add additional information about the problem?
Assignment: 
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Answer: 
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Explanation: 
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[ Step One ] Switch Sides

[ Step Two ] Add 4 To Both Sides

[ Step Three ] Simplify

[ Step Four ] Check Your Work

[ Step Five ] Question: Is Equation Correct

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25-9=16 so 16 is the answer