Please help!! Solve for n.

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Aphrase is shown read the phrase and give me the answer

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2