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Brother's math problem
Calculated in two parts:

Calculate how much money to withdraw first. Suppose: the money withdrawn is X yuan. Solution: (500-X)/3=300-X Multiply both sides by 3:

500-X=900-3X 2X=400 X=200 yuan;

Calculate how much each brother has left now: Brother: 500-200=300 yuan; 300÷3= 100。

Brother: 300-200= 100 (yuan).

Answer: My brother now deposits in 300 yuan, and my brother deposits 100 yuan.