The price of 4 packets of monosodium glutamate and 2 packets of sugar minus the price of 4 packets of monosodium glutamate and 10 packets of sugar is the price of 8 packets of sugar, so the price of each packet of sugar is (82-42)÷( 10-2)=5 (yuan).

Price of monosodium glutamate per package: (4 1-5*5)÷2=8 yuan.

So every package of monosodium glutamate 8 yuan, every package of sugar 5 yuan.

2.6 TV sets and 16 tape recorder price: 7250*2= 14500 (RMB).

Price of 6 TV sets and 15 tape recorders: 4700*3= 14 100 Yuan.

Then the price of a tape recorder:14500-14100 = 400 yuan.

Price of TV set: (4700-400*5)÷2= 1350 (RMB)

So the unit price of TV set is 1350 yuan, and the unit price of tape recorder is 400 yuan.

3. ① Weight of 24 bags of peanuts and 24 bags of soybeans: 420*2=840(kg)

② The weight of 24 bags of peanuts and 45 bags of soybeans: 385*3= 1 155(kg).

②-①, get the weight of 2 1 bag of soybeans, and the weight of each bag of soybeans is (1155-840) ÷ (45-24) =15 (kg).

The weight of each bag of peanuts: [420-15 *12] ÷12 = 20 (kg).

So each bag of peanuts is 20kg, and each bag of soybeans is 15kg.