Answer:
50hrs
Step-by-step explanation:
First, find how much he is missing to go to the trip.
2500-1250=1250
Now, take the missing amount divided by 25, to find out how many groups of 25, which represents the hours he still needs to work, in order to go on the trip.
1250/25= 50
Please don't forget to write hrs in your final answer as the units
/ represents divide