Solution:

Two Good For Me

Explanation:
Two Good ( 2 times good)
For Me (for => Four, four times me)

Solution:

17

Explanation:
1
3 = one (3 letters)
8 = three (5 letters) + one (3 letters)
13 = Eight (5 letters) + three (5 letters) + one (3 letters)
21 = Thirteen (8 letters) + Eight (5 letters) + three (5 letters) + one (3 letters)
17 = twentyOne (9 letters) + Thirteen(8 letters)

Solution:

3 lbs.

Explanation:
Based on information provided, we can deduce that
3/4 lbs = 1/4 of soap weight
=> soap weight = 4 x 3/4 = 3 lbs

Solution:

East

Explanation:
- Right Turn => North Direction
- About Turn => south Direction
- Left Turn => East Direction

Solution:

The man with the cast

Explanation:
Reason-1: The blood strain is on the left side of the dead man which means the killer is most likely a left-handed. The cashier and man with the cashier are both right-handed.

Reason-2: Why will a man with the cast go for buying shirts/coat? Seems suspicious.

Reason-3: The man with the cast must be carrying the weapon inside the cast.

Solution:

The white chip is circled.

Solution:

Sheldon filled a Mug with water and held it over his head for 10 minutes.

Solution:

It

Solution:

A keyhole

Explanation:
It goes right through the door but is stuck to the door i.e never comes in or goes out.

Solution:

16