To convert the maximum takeoff weight from pounds to tons, you can use the conversion factor that 1 ton is equal to 2,000 pounds.
To find the maximum takeoff weight in tons, you can use the following expression:
\[ \text{Max takeoff weight in tons} = \frac{\text{Max takeoff weight in pounds}}{2000} \]
So for the cargo plane with a max takeoff weight of 910,000 pounds, the expression would be:
\[ \text{Max takeoff weight in tons} = \frac{910,000 \text{ pounds}}{2000} \]
You can simplify that as well:
\[ \text{Max takeoff weight in tons} = 910,000 \div 2000 \]
This expression will give you the maximum takeoff weight in tons.