3. What is a half of a third, plus a third of a quarter, plus a quarter of a fifth?
A $\frac{1}{1440}$
B $\frac{3}{38}$
C $\frac{1}{30}$
D $\frac{1}{3}$
E $\frac{3}{10}$
3. E Half of a third, plus a third of a quarter, plus a quarter of a fifth equals
$$
\frac{1}{6}+\frac{1}{12}+\frac{1}{20}=\frac{10+5+3}{60}=\frac{18}{60}=\frac{3}{10} \text {. }
$$