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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.

Free practice: System 32 (long–short–short–long)Score 0/0
01020304054321010203040876543210123
On the table, the ringed ball is your ball (1). 2 = the ball your cue ball hits first, 3 = the last ball to hit for the point.
System 32 (long–short–short–long)
Aim = Start − Arrival × Factor
Your ball:White(cue ball · 1)
Ball 2RedBall 3Yellow
Expected shot:System 32 (long–short–short–long)Bricole (cushion first)Cushion orderLong → Short → Short → Long

The cue ball goes to the cushions before touching any ball; after the cushions in order it hits the balls.

Given:
Arrival5Start30
In this position, what is Aim?

Task: put the given values into the system's formula and calculate Aim. Enter the answer as the number read on the table's Aim scale.