4

Add the letter 'G' and it becomes Gone.

Colgate

Boo

Coffin

70
30 divide 1/2 = 60 + 10 = 70.

Shadow.

Bracken brew.

They are equal
36 % of 67 = 36 x 67 / 100 = 24, 12
67 % of 36 = 67 x 36 / 100 = 24, 12

Tuesday.

Is the name of a person and not the day on which they went.

Flip switch number 1 and wait a few minutes. Flip switch number 1 back to its original position, and then immediately flip switch number 2.

Open the door. If the light is on, then switch number 2 controls it. If the light is off, then go and feel the bulb with your hand. If the bulb is hot, the switch number 1 controls it, and if the bulb is cold, then switch number 3, the one you did not touch, controls it.

Wake up.