A ton is approximately 2,000 pounds.
The maximum load that Chris' truck can carry = 4 tons x 2,000 pounds/ton = 8,000 pounds.
Compute for the number of trips needed:
Number of trips = 26,000 \u00F7 8000 = 3.25
But, remember that he wants to transport all
of the load, so, while 3 trips would take care of most of it, he'd still have the .25 of a load to take, requiring a fourth trip.
So, the answer is 4 trips.