Question

Calculati:
(1111+2222+......+9999):1111+55

Answer 1

$\displaystyle (1111+2222+...+9999):1111+55= \\ \\ =(1+2+3+...+9)+55= \frac{9(9+1)}{2} +55= \\ \\ = \frac{9 \times 10}{2} +55= \frac{90}{2} +55=45+55=100$