The height to length ratio of a brick wall is 3: 20. the wall is 40 feet long. how high is it

This is a ratio so we can simply set up a relation to find the unknown dimension...

If 3:20=h:l we can say:

3/20=h/l  and we are told l=40 so:

3/20=h/40  multiply both sides by 40

120/20=h  do indicated division

h=6 ft

So the wall is 6 feet high.

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