Bus

At the A bus stop boarded 6 people into the bus and on each other bus stop one man more than the previous one. On E station never boarded. Stops are A, B, C, D, E.

Calculate the number of people on the bus after leaving the station E.

Correct result:

x =  31

Solution:

$$\begin{gathered} A=6 \\ B=A+1=6+1=7 \\ C=B+1=7+1=8 \\ D=C+1=8+1=9 \\ E=0 \\ x=A+B+C+D+E+1=6+7+8+9+0+1=31 \end{gathered}$$

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