Question 543248
This is about learning how to set up problems since there is a very simple calculation involved.
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Let p = # minutes puppies are exercised
Let d = # minutes dogs are exercised
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given:
p = 45 minutes
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The wording about puppies being exercised 15 minutes more than dogs can be written as this equation:
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p = d + 15 minutes
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The task here is to solve for d, the number of minutes dogs are exercised.  This equation can be rewritten in terms of solving for d.
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Subtract 15 minutes from both sides:
p - 15 = d
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Substitute in the given value for p:
45 - 15 = d
30 = d
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dogs are exercised for 30 minutes
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cheers,
Lee