Interesting paradise of Mathematics Q: it costs 66 yuan for mom to buy 2kg meat and 3000 fish, and 102 yuan for Dad to buy 4kg meat and 3kg fish. Please calculate the meat. How much is each kilogram of fish?

Interesting paradise of Mathematics Q: it costs 66 yuan for mom to buy 2kg meat and 3000 fish, and 102 yuan for Dad to buy 4kg meat and 3kg fish. Please calculate the meat. How much is each kilogram of fish?

It's 18 yuan per kilogram for meat and 10 yuan per kilogram for fish
Set X yuan per kilogram of meat and Y yuan per kilogram of fish
The following equation is obtained
Formula 2x + 3Y = 66
4X + 3Y = 102 Formula Two
Formula one subtracts formula two to get 2x = 36, so x = 18
Then substitute x = 18 into 36 + 3Y = 66 of Formula 1, so y = 10