Brother and sister, uncle and aunt, do me a favor There are 21kg biscuits left in box a and 19kg biscuits left in box A. if there are 1lg biscuits left in box a and Box B, how many kg biscuits are there

1. 21 kg remaining in armored box
2. 21kg and then fill box B, which is equivalent to two boxes of box a and Box B, at this time, there is 1kg left
Box B: 21-1 = 20kg
Similarly:
Box a: 19-1 = 18kg
Biscuit: 20 + 18 + 1 = 39kg

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