Answer: 68 adults and 51 students attended the play.
Step-by-step explanation:
Let x = Number of adults
y= Number of students
As per given,
[tex]10x+6y=986\ \ \ \ (i)\\\\ y=\dfrac34x\ \ \ \ (ii)[/tex]
Put (ii) in (i) , we get
[tex]10x+6(\dfrac34x)=986\\\\\Rightarrow\ 10x+\dfrac{9}{2}x=986\\\\\Rightarrow\dfrac{29}{2}x=986\\\\\Rightarrow\ x=\dfrac{986\times2}{29}\\\\\Rightarrow\ x=68[/tex]
So, [tex]y=\dfrac{3}{4}\times68=51[/tex] (from (ii))
Hence, 68 adults and 51 students attended the play.