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Hard riddle


Mat961
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The equation TL*BR*9 + TR*2 - BL*52 (where TL = top left digit, BR = bottom right digit, etc.) will give the three known answers.

Thus

3*8*9 + 2*2 - 4*52 = 216 + 4 - 208 = 12

4*2*9 + 6*2 - 1*52 = 72 +12 - 52 = 32

2*9*9 + 4*2 - 3*52 = 162 + 8 -156 = 14

But then a total of "30" is not obtained with the unknown ... so I don't know whether that figure was a thumb suck or not!

5*6*9 + 3*2 - 3*52 = 270 + 6 - 104 = 172

Possibly still a valid answer, though.

 

 

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