Answer:
105
Explanation:
25 + 25 + 25 + 30 = 105 so the three 25$ are the hours so three hours plus the fee of the plumber going there
3 hours
We know that $30 of the $105 bill was just to come to the house, leaving $75 of the bill due to the hours spent. Since the rate per hour is $25/hour, that means 75/25 = 3 hours were spent at the house
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