3/10 + 2/5 :4/15
= 3/10 + 2/5 x 15/4
= 3/10 + 3/2
= 3/10 + 15/10
= 18/10
= 9/5
3/10 + 2/5 :4/15
= 3/10 + 3/2
= 9/5.
\(\dfrac{3}{10}+\dfrac{2}{5}:\dfrac{4}{15}=\dfrac{3}{10}+\dfrac{2\times15}{5\times4}=\dfrac{3}{10}+\dfrac{3}{2}=\dfrac{3}{10}+\dfrac{15}{10}=\dfrac{18}{10}\)
3/10 + 2/5 :4/15
= 3/10 + 3/2
= 9/5