Take a quarter of the pears from box a and a fifth from box B At this time, the weight of the remaining pears in the two boxes is equal?

160 × (1-1 / 4) = 120 kg
120 (1-1 / 5) = 150 kg

There are 45 apples in both cases. If you take 5 apples out of box a and put them in your own box, the number of apples in Box B is more than that in box a (?%)

（5+5）÷（45-5）
=10÷40
=25%

The weight ratio of a and B is 4:5. If 6 kg is taken from B and put into a, the weight ratio of the two boxes is 5:4. How many kg apples are there in the two boxes?

Let a 4x and B 5x
（4x+6）:(5x-6)=5:4
16x+24=25x-30
25x-16x=24+30
9x=54
x=6
Total (4 + 5) X6 = 54 kg

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