Question

7/20 + ___=19/20 is the answer 3/5

Answer 1

we must solve this equation:

`(7)/(20)+x=(19)/(20)`

First, we must move 7/20 to the right hand side as -7/20. It yields,

`x=(19)/(20)-(7)/(20)`

and now we can substract these fractions,

`\begin{gathered} x=(19-7)/(20) \\ x=(12)/(20) \end{gathered}`

since 12=4*3 and 20=4*5, we can rewrite this result as

`\begin{gathered} x=(4\cdot3)/(4\cdot5) \\ \end{gathered}`

and finally, the answer is x=3/5