If this has been written in medical notes it may refer to the CHADS2 score. In patients with Atrial Fibrilation the CHADS2 score determines the risk of having a stroke and helps to determine whether a patient should be started on warfarin therapy to prevent this.
C = Cardiac failure (1)
H = Hypertension (1)
A = Age >75 (1)
D = Diabetes (1)
S = Stroke/TIA (2)
score 0-1 - usually requires aspirin
score 2+ warfarin
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2x+52=0 =>2x= -52 =>x= -52/2 =>x= -26
52 tens = 52 x 10 = 520
The most that you can get is 52% but that assumes you did not get any answers wrong. Is that realistic?
It is: 47+52+63+66 = 228/4 => 57 which is the average mean
* Multiply by 10 (by addind a zero to the right of the number), * then double: Example - multiply 52 by 20: 52 x 10 = 520 double 520 = 1040