2. If from the number of students in class $5 \mathrm{~A}$ we subtract 23 and multiply the resulting difference by 23, we get the same as if we subtracted 13 from this number and multiplied the difference by 13. How many students are there in class 5 A?
2. Let there be $x$ students in class 5A, then $(x-23) \cdot 23=(x-13) \cdot 13$, from which $10 x=360$ and $x=36$.