2questions.. need help

12.        (25359-!-item-!-188;#058&001894)
                

Finding of a survey
of Systems magazine subscribers:  Thirty
percent of all merchandise orders placed by subscribers in response to
advertisements in the magazine last year were placed by subscribers under age
thirty-five.
                

Finding of a survey
of advertisers in Systems magazine:  Most
of the merchandise orders placed in response to advertisements in Systems last
year were placed by people under age thirty-five.

For both of the
findings to be accurate, which of the following must be true?
                

(A) More subscribers
to Systems who have never ordered merchandise in response to advertisements in
the magazine are age thirty-five or over than are under age thirty-five.

(B) Among
subscribers to Systems, the proportion who are under age thirty-five was
considerably lower last year than it is now.

(C) Most merchandise
orders placed in response to advertisements in Systems last year were placed by
Systems subscribers over age thirty-five.

(D) Last year, the
average dollar amount of merchandise orders placed was less for subscribers
under age thirty-five than for those age thirty-five or over.

(E) Last year many
people who placed orders for merchandise in response to advertisements in
Systems were not subscribers to the magazine. 

Ans: E

24.        (29155-!-item-!-188;#058&003857)
                

Tiger beetles are
such fast runners that they can capture virtually any nonflying insect.  However, when running toward an insect, the
beetles intermittently stop, and then, a moment later, resume their
attack.  Perhaps they cannot maintain
their pace and must pause for a moment's rest; but an alternative hypothesis is
that while running tiger beetles are unable to process the resulting rapidly
changing visual information, and so quickly go blind and stop.

 Which of the
following, if discovered in experiments using artificially moved prey insects,
would support one of the two hypotheses and undermine the other?

(A) When a prey
insect is moved directly toward a beetle that has been chasing it, the beetle
immediately turns and runs away without its usual intermittent stopping.

(B) In pursuing a
moving insect, the beetles usually respond immediately to changes in the
insect's direction, and pause equally frequently whether the chase is up or
down an incline.

(C) The beetles
maintain a fixed time interval between pauses, although when an insect that had
been stationary begins to flee, the beetle increases its speed after its next
pause.

(D) If, when a
beetle pauses, it has not gained on the insect it is pursuing, the beetle
generally ends its pursuit.

(E) When an obstacle
is suddenly introduced just in front of running beetles, the beetles sometimes
stop immediately, but they never respond by running around the barrier.

Ans: C