1. Volume of wood box = 50.0cm x 50.0cm x 45.0cm.
                                   Â
= 112500 cm3
                       Â
1 cm3 = 1 mL = 10-3 L
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= 112500 * 10-3 L
                                  Â
= 112.5 L
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= 112 L to three significant figures
2. 1 kg = 2.2 lb
    1 lb = 1/2.2 kg
     5 lb  = (1/2.2) * 5
kg
              Â
= 2.2727 kg