Let the number of nuts and bolts be 7x and 9x respectively.
[tex] \tt { \therefore{9x = 36}}[/tex]
Solving the formed equation :
[tex]: \implies \sf 9x = 36 \\ \\ [/tex]
[tex]: \implies \sf x = \cancel{\dfrac{36}{9} }[/tex]
[tex]: \implies{\underline {\boxed{ \tt x = 4 }}}[/tex]
[tex]\huge {\therefore}[/tex] The number of number of nuts are 7x = 7*4 = 28.