How many pints are in 80 ounces?

First, determine the number of classes in a population of 5469 students

\(5469\ students\ast\frac{1\ class}{20\ students}=273.45\ classes\)

There are about 273 classes and if we assume 1 class to be represented by 1 teacher, then the number of teachers to be hired is:

Number of teachers to be hired=273-230=43 teachers

Thus, the school district will hire 43 teachers to supplement their staff of 230 teachers

Compare the four fractions, find the least common divisor for denominators 7, 6, 9 and 8 which is 504.

Now multiply each fraction with 504 as:

4/6*504=336

4/8*504=258

4/9*504=224

4/7*504=288

From the above calculations, 336 is the greatest, which follows that 4/6 is the largest fraction.

0.9 divided by 0.15 is determined using a calculator as follows

\(\frac{0.9}{0.15}=6\)

First convert 3 1/6 into an improper fraction as follows

\(3\frac{1}{6}=\frac{\left(3\ast6\right)+1}{6}=\frac{18+1}{6}=\frac{19}{6}\)

Now carry out subtraction

\(\frac{19}{6}-\frac{5}{6}=\frac{14}{6}=\frac{7}{3}=2\frac{1}{3}\)