Pour 10 liter cup into 3 liters, and then pour 3 liters into 7 liters cup; /kloc-there are 7 liters left in the 0/0 liter cup, then pour in the 3 liter cup, and there are 4 liters left, and pour the 3 liter cup into the 7 liter cup; 10L cup is poured into 3L cup, leaving 1L, 3L cup is poured into 7L cup, 7L cup is full, 3L cup has 2l; Pour all 7 liters of water from the 7-liter cup into the 10-liter cup, 8 liters from the 10-liter cup, and 2 liters from the 3-liter cup into the 7-liter cup; Pour 8 liters of water from the 10 liter cup into the 3 liter cup, leaving 5 liters of water from the 10 liter cup, and then pour the water from the 3 liter cup into the 7 liter cup, which is exactly 5 liters. See if you can read it. I hope you can adopt it. Thank you!