Write the result of the following expressions in decimal form.
(a) $7 \times \frac{2}{3}+16 \times \frac{5}{12}$
(b) $5-\left(2 \div \frac{5}{3}\right)$
(c) $1+\frac{2}{1+\frac{3}{1+4}}$
We have:

(a) $7 \times \frac{2}{3}+16 \times \frac{5}{12}=\frac{14}{3}+\frac{20}{3}=\frac{34}{3}=11+\frac{1}{3}=11.3333 \ldots$

(b) $5-\left(2 \div \frac{5}{3}\right)=5-\left(2 \times \frac{3}{5}\right)=5-\frac{6}{5}=4-\frac{1}{5}=3.8$

(c) $1+\frac{2}{1+\frac{3}{1+4}}=1+\frac{2}{1+\frac{3}{5}}=1+\frac{2}{\frac{8}{5}}=1+2 \times \frac{5}{8}=1+\frac{10}{8}=2+\frac{1}{4}=2.25$