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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 30Score 0/0
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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 30
Aim = 30 − 7.5 × (shift of point x / 10)
Your ball:White(cue ball · 1)
Ball 2YellowBall 3Red
Expected shot:System 30Ball firstCushion orderLong → Short → Long → Long

The cue ball hits ball 2 first, then travels the cushions in order to ball 3.

Given:
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.