Question

____+3/10=3/15 option 3/5

Answer 1

`_{}-+(3)/(10)=(3)/(15)`

First we can simplify the result

`(3)/(15)=(1)/(5)`

in order to know the missing fraction, we will call x

`\begin{gathered} x=(1)/(5)-(3)/(10) \\ x=-(1)/(10) \end{gathered}`

we can check it

`-(1)/(10)+(3)/(10)=(2)/(10)=(1)/(5)=(3)/(15)`