TX is the altitude as it is perpendicular to the base TW and UV
The square angle marker at point X indicates a right angle (aka 90 degree angle)
Note: altitude is another way of saying "height"
Since Timothy collected more, we take the amount Timothy collected and subtract the amount Eric collected from that.

That means Timothy collected .5 kilograms more candy than Eric.
WORK:
8×2 = 16
3×2 = 6
ANSWER:
D.) 16/6