A model boat is made to a scale of 1:20. This scale can be applied to any units, so 1mm measured on the model is 20mm on the actual boat, 1 cm measured on the model is 20cm on the actual boat.
a) If the 1:20 model boat is 15cm wide, how wide is the actual boat?
b) If the boat has a mast of height 4m, how high is the mast on the model?
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