The answer to the last question on page 6 of the first volume of sixth grade mathematics knowledge and ability training
Solution: Let B have X kilograms and A have 1.5 kilograms.
1.5x-x=2.5
0.5x=2.5
x= 10
1.5X = 10× 1.5 = 15
Answer: B has 10 kg, and A has 15 kg.