the magnitude of the tongue produced by a 3.0n force applied to a door at a perpendicular distance of 0.25 m from the hinge

Answer 1

You seem to be confusing tongues with torques.

Review the definition of tor

Answer 2

Torque is force times distance from an axis of rotation (the hinge in this case)

Multiply the two numbers you have been given

Answer 3

T=(f)(d)
torque=force x distance

T=40NM
D=30cm=0.3m
F=?

T=(f)(d)...F=T/D
F=40NM/0.3m
=133.3N

Answer 4

0.37