In order to welcome the National Day Golden Week, a well-known scenic spot has launched two preferential schemes, A and B: A: One-day tour of the scenic spot: all tickets for adults to 80 yuan, small.

Option a costs:

80+80×4×40%

=80+ 128,

=208 (yuan);

Option b costs:

(4+ 1)×80×60%

=5×80×60%,

=240 yuan.

208 yuan < 240 yuan.

Answer: For 1 adult and 5 children, option A is the most economical.

(2)2 adults and 4 children.

Option a costs:

80×2+80×4×40%

= 160+ 128,

=288 (yuan);

Option b costs:

(2+4)×80×60%

=6×80×60%,

=288 (yuan);

In other words, the cost of these two schemes is the same.

A: The cost of two adults and four children is the same.

(3) Beibei, Tian Tian and their parents are 6 people, namely 4 adults and 2 children.

Option 1 costs:

80×4+80×2×40%

=320+64,

=384 yuan;

Option 2 costs:

6×80×60%=288 yuan.

288 yuan < 388 yuan.

That is, the second option is the most economical.

A: There are four adults and two children. Option 2 is the most economical.