The answer would be 15:3 :)
Draw a line in its proper length, type ALIGN into the command line and press ENTER . SELECT THE IMAGE U WANT O SCALE AND PRESS ENTER. CLICK AT THE FIRST OIN TOF THE DIMENSION ENTER THE RUE LENGHT OF THE DIMENSION AND PRESS ENTER. .... I THINK
<span>...
| 12: 2 + 4 x (3 +5) =
2 x | 12: 2 + 4 x (3 +5) =
</span> | 12: 2 + 4 x (3 +5) =
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2 x 36: 6 + 12 x (9 +15) =
2 x 6 + 12 x 24 =
2 x 6 + 288 =
12 + 288 = 300