1, the ratio of difference to meiosis is 3:4, difference is regarded as 3 meiosis and 4 meiosis, difference+meiosis = meiosis, so meiosis is 7, and then 3+4+7= 14 is distributed in proportion, and the difference accounts for 3/ 14, so/kloc-0.

2. Use the direct ratio formula with work efficiency of 40%: 6 =1:x.

0.4x=6

x= 15

3. Supermarket A: 20÷(4+ 1)=4 (block) 20-4= 16 (block)

Supermarket B: 20×80%= 16 (block)

Both supermarkets pay the original price of 16 moon cakes, so the two supermarkets are the same.