Mechanical advantage is defined as the ratio of output force and input force
so we can say it is
[tex]\eta = \frac{F_{out}}{F_{in}}[/tex]
now here we know that on a see saw torque is balanced
so we can say
[tex]F_1r_1 = F_2r_2[/tex]
so here it is given as
[tex]F_{in}\times 1.5 = F_{out} \times 2[/tex]
so here we can say
[tex]\eta = \frac{F_{out}}{F_{in}} = 0.75[/tex]
so mechanical advantage will be 0.75
