两个小阴线夹着一根大阳线

To be able to come here, they must have calculated their expenses in advance. Su Xiaoji and Zhao Xiaosong counted them before they came. There were twenty-six students in the class, each worth thirty yuan, which is 780 yuan. Before going out, Su Xiaoji carefully counted the expenses. I have prepared a full thousand yuan, how could it not be enough now?...