Answer :
Cross multiply.
[tex] \frac{26}{f} = \frac{26}{6} [/tex]
[tex](26*6) = 26f[/tex]
Divide by 26 on both sides.
[tex]f=6[/tex]
[tex] \frac{26}{f} = \frac{26}{6} [/tex]
[tex](26*6) = 26f[/tex]
Divide by 26 on both sides.
[tex]f=6[/tex]