Simply work out the equation:
 
 (3 * 10³) = 3 * 1000 = 3000
 (2 * 10²) = 2 * 100 = 200
 3000 + 200 = 3200

 3200 = a * 10³
 3200 = 1000a
 a = 3200/1000 = 16 / 5
 

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