17.If the tiger is in enclosure 5 and the lion is in enclo-
sure 3， moving the tiger to which of the following
enclosures requires exactly two transfers？
（A） 2
（B） 3
（C） 4
（D） 6
（E） 7
18.If the lion is in enclosure 6 and the tiger is in enclo-
sure 7， and the lion is to be moved to enclosure 7 and
the tiger to enclosure 6， then which of the following
must be true？
（A） The lion is transferred to enclosure 3 at some
time during the move.
（B） The tiger is transferred to enclosure 5 twice.
（C） One of the two animals is transferred to
enclosure 3 twice.
（D） Three transfers to enclosure 5 are made.
（E） At least one transfer is made to either enclosure
2 or enclosure 4.
19.If the lion is in enclosure 3 and the tiger is in enclo-
sure 4， and the lion is to be moved to enclosure 5 and
the tiger to enclosure 7， then exactly how many trans-
fers must be made？
（A） Four
（B） Five
（C） Six
（D） Seven
（E） Eight
20.If the lion is in enclosure 1 and the tiger is in enclo-
sure 7， and the lion is to be transferred to enclosure 3
and the tiger to enclosure 1， then which of the fol-
lowing CANNOT be true？
（A） The lion is transferred to enclosure 2 in the first
transfer.
（B） The lion is transferred to enclosure 3 in the
second transfer.
（C） The lion is transferred to enclosure 4 in the
second transfer.
（D） The tiger is transferred to enclosure 5 in the first
transfer.
（E） The tiger is transferred to enclosure 3 in the
second transfer.
21. If the lion is in enclosure 1 and the tiger is in enclo-
sure 3， and the lion is to be moved to enclosure 6 and
the tiger to enclosure 5， then the second transfer could
be a transfer of the
（A） lion to enclosure 2
（B） lion to enclosure 5
（C） tiger to enclosure 4
（D） tiger to enclosure 5
（E） tiger to enclosure 7
22.If the lion is in enclosure 3 and the tiger is in enclo-
sure 6， and the lion is to be moved to enclosure 6 and
the tiger to enclosure 3， then which of the following
must be true？
（A） Exactly five enclosures are used in the move
（B） One animal is transferred exactly twice as many
times as the other animal.
（C） All of the transfers of the lion are completed
before any transfer of the tiger occurs.
（D） At one point one of the animals is transferred to
either enclosure 2 or enclosure 4.
（E） At one point neither the lion nor the tiger is in
enclosure 3， enclosure 5， or enclosure 6.
