115. Simple multiplication. Simplify, as much as possible, the fraction $\frac{116690151}{427863887}$.
115. The sum of the digits of the numerator is 30, so it is divisible by 3. The difference between the sums of the alternating digits of the denominator is $32-21=11$; hence, the denominator is divisible by 11. Factoring out these factors, we get

$$
\frac{116690151}{427863887}=\frac{38896717 \cdot 3}{38896717 \cdot 11}=\frac{3}{11}
$$