There is a 4-foot fence that surrounds your backyard. The fence casts a shadow that is 5 feet long. If you are 6 feet tall and standing next to the fence, how long will your shadow be?

My shadow would be 7 feet tall.

Since I am standing next to the fence, then whatever difference its actual height and its shadow has, will be the same difference of my shadow to my actual height.

fence: Actual height - 4 ft; Shadow height - 5 ft; difference - 1 ft

me : Actual height - 6 ft : Shadow height - ?; difference - 1ft

Shadow Height - Actual Height = 1 ft

Sh - 6ft = 1ft

Sh = 1ft + 6ft

Sh = 7ft