Answer :
"The sum of the number 'n' and 31" . . . . . (n + 31)
"17 times the sum" . . . . . 17(n + 31)
The equation . . . . . 17(n + 31) = 357
"17 times the sum" . . . . . 17(n + 31)
The equation . . . . . 17(n + 31) = 357
[tex][tex]Ans.\ the\ quation\ is:\ \ \ \ \ 17\cdot(n+31)=357[/tex]\ /:17\\\\n+31=21\\\\n=21-31\\\\n=-10[/tex]