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SMO 2005 Open Round 1 Question 8

SMO · SMO 2005 Open Round 1

Question 8

If $x$ is a real number that satisfies

$$\left\lfloor x+\frac{11}{100}\right\rfloor+\left\lfloor x+\frac{12}{100}\right\rfloor+\cdots+\left\lfloor x+\frac{99}{100}\right\rfloor=765,$$

find the value of $\lfloor100x\rfloor$. Here $\lfloor a\rfloor$ denotes the largest integer $\le a$.