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Math problem 2, brother
Elder brother's surplus: (240- 100)/2=70 yuan.

Zuo Ge: 70*3=2 10 (yuan)

They originally brought 210+100 = 310 (yuan).

The key is to understand this sentence, which means that the difference of 240- 100 is two of them, so you have to divide by 2. You can draw a picture to understand it. (Draw two lines with two lengths, one is 240, the other is 100, the first one has one left, and the second one has three left. )