Answer:
20 Feet
Explanation:
If the trucks are all 7 feet tall, and 6 feet wide, then we can find out how long we need the truck to be by using this equation:
(l = length)
7 × 6 x l = 840
Or we can simply multiply 6 and 7 then divide 840 by that number.
6 × 7 = 42
840 ÷ 42 = 20
The truck would need to be 20 feet long to carry all of your furniture.