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A sixth-grade Olympic math problem about scores ~ please help me solve it for 30 minutes!
Brother Zuo: 1- 1/4=3/4. 3/4 of the younger brother is equal to 4/5 of the older brother.

Brother's deposit and brother's ratio: 4/5 ÷ 3/4 = 16: 15.

16+ 15=3 1,

My brother's deposit is:186×16/31= 96 yuan.

My brother's deposit is:186×15/31= 90 yuan.

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