Answer :
[tex]:\implies\sf\:5x+3y[/tex]
Given that, x = 1/2 and y = 2/5
[tex]:\implies\sf\:4\times \dfrac{1}{2}+3\times \dfrac{2}{5}[/tex]
[tex]:\implies\sf\:\dfrac{4}{2}+\dfrac{6}{5}[/tex]
[tex]:\implies\sf\:2+\dfrac{6}{5}[/tex]
Taking LCM,
[tex]:\implies\sf\:\dfrac{(2\times 5)+6}{5}[/tex]
[tex]:\implies\sf\:\dfrac{10+6}{5}[/tex]
[tex]:\implies\bf\:\dfrac{16}{5}[/tex]
