"Que Tongue" tea produced in Pujiang County, Sichuan Province is a well-known brand in Sichuan Province. Our school once organized Children's Day on June 1st.

Solution: (1) Suppose people X choose "fried green", then people (30-x) choose fresh tea "Maojian".

Therefore, fresh tea leaves can be "fried" by 20x；; Fresh tea "Maojian" 5 (30-x) is enough.

(2) Arrange X people to use "fried green" and Y people to use "Maojian".

rule

x+y=30

20x/4+5(30-x)/5= 102

Solution:

x= 18 y= 12

That is, 18 people use "fried green" and 12 people use "Maojian".

(3) We arranged for X people to adopt "Fried Green", and then

20x/4+5(30-x)/5≤ 1 10 20x/4+5(30-x)/5≥ 100

Solution: 17.5≤x≤20.

① 18 people used "stir-fried green" and 12 people used "Maojian".

② 19 adopts "stir-fried green", 1 1 adopts "hairy tip".

③20 people used "fried green" and 10 people used "Maojian".

So there are three options.

(1) profit of the scheme. 18× 20 ÷ 4× 40+12× 5 ÷ 5×120 = 5040 yuan;

The profit of scheme 2 is.19× 20 ÷ 4× 40+1× 5×120 yuan;

The profit of the third scheme is 20× 20 ÷ 4× 40+10× 5 ÷ 5×120 = 5200 yuan;

∴ Option (3) The maximum profit is 5,200 yuan.

That is to say, 20 "fried vegetables" are distributed, and 10 people use "Maojian" to get the maximum profit, with a maximum profit of 5,200 yuan.