Write a real world problem that you could represent with the equation 20 - n = 4. Solve the equation to find the answer to your problem

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Organisms that live in the alpine and taiga biomes have developed unique adaptations that aid in their survival. the douglas-fir is a conifer tree that grows in the taiga biome. it has an average height of about 70 feet, and its wood is an important source of lumber.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64