A dump truck brought 1⁄3 of a ton of rock on the first trip, 5⁄6 of a ton on the second trip, and 5⁄12 of a ton on the third trip. What was the total weight of the rock?

First convert the numbers to get the same denominator

1/3=4/12

5/6=10/12

5/12

Then add them all together

4/12+10/12+5/12 = 19/12

Then reduce

1 7/12

Your answer is 1 ton and 7/12 of a ton