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If eggseller A used u trays , then eggseller B used ( u + 6 ) trays.

Since they both had the same number of eggs,

30u = 25 ( u + 6 ) + 10

30u = 25u + 150 + 10            subtract 25u both sides

5u = 160

u = 32

30u = 32 * 30 = 960

Each eggseller had 960 eggs  . 

Check: 25 ( 38) + 10 = 900 + 50 + 10 = 960 checked.

 

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