Question

Answer 1

\(\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{8}{10}+\dfrac{15}{20}+\dfrac{20}{30}\)

\(=\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{4}{5}+\dfrac{3}{4}+\dfrac{2}{3}\)

\(=\left(\dfrac{1}{3}+\dfrac{2}{3}\right)+\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)\)

\(=1+1+1\)

\(=3\)

Answer 2

\(\left(\dfrac{1}{3}+\dfrac{20}{30}\right)+\left(\dfrac{1}{4}+\dfrac{15}{20}\right)+\left(\dfrac{1}{5}+\dfrac{8}{10}\right)\)

= 1               +       1           +1

=           3