While building his deck peter uses boards that are 14 cm wide. he leaves a gap of 2 cm between boards. if peter makes a deck that is 20 boards wide, what is the total width of his deck?

318 cm . . . or 3.18 m

2 boards have 1 gap. 3 boards have 2 gaps. 20 boards will have 19 gaps.

... total width = board width + gap width

... = 20×(14 cm) + 19×(2 cm)

... = 280 cm + 38 cm = 318 cm

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