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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.