Hi to all!!! I have problems in understanding the answers to also these questions (which i put in bold)

Could you please help me out in explaining them to me??

Thanks alot for continueing helping me and letting me improve my quant skills!!

Riccardo

SET 17

Q8:

A cash register in a certain clothing store is the same distance from two dressing rooms in

the store. If the distance between the two dressing rooms is 16 feet, which of the

following could be the distance between the cash register and either dressing room?

I. 6 feet

II. 12 feet

III. 24 feet

A. I only

B. II only

C. III only

D. I and II

E. II and III

Q15:

If R = P/Q , is R = P ?

(1) P is greater than 50

(2) 0 is less than Q = 20

Answer is E, but I thought C

Q21:

Martin has worked for the last 30 years. If his average (arithmetic mean) total annual

earnings for the first 5 years is $15,000, what is his average total annual earnings for the

last 5 years?

(1) Martinâ€™s average total annual earnings for the first 25 years is $27,000.

(2) Martinâ€™s average total annual earnings for the last 25 years is $34,000.

Answer is C, nut I though 1 was sufficient (and therefore chose A) is it not?

SET 20

Q18:

A rectangular region has a fence along three sides and a wall along the fourth side. The

fenced side opposite the wall is twice the length of each of the other two fenced sides. If

the area of the rectangular region is 128 square feet, what is the total length of the fence,

in feet?

A. 4

B. 8

C. 16

D. 32

E. 64

I got C here, cause I have that the smaller fence sides are 4 each and then we have another which is 2*4= 8 so it should be 16, I donâ€™t understand this solution!