Find the missing side length, n. ABC

Is fgh ~ jkl? if so, identify the similarity postulate or theorem that applies.

After the seventh month of a 12-month loan: the numerator is: {(n + 11) + (n + 10) + (n + 9) + (n + 8) + (n + 7) + (n + 6) + (n + 5)} = , and the denominator is: {(n) + (n + 1) + + (n + 11)} = . therefore, the fraction is numerator/denominator (to the nearest tenth) = %

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?