Key stroke counter:

Group 1 Start Attempt Allowed keys: 3, 7, x, /, +, -, = Target result Key strokes 11 15 19 Result:

Group 2 Start Attempt Allowed keys: 2, 8, x, /, +, -, = Target result Key strokes -9.5 5.25 19 Result:

Group 3 Start Attempt Allowed keys: 5, 9, x, /, +, -, = Target result Key strokes 19 20 21 Result: