Question

# https://photos.app.goo.gl/Sp5b6Td3uLgjn3q49

Solution

## Let h = the height of all the boards = ? Let x = the number of boards =9 Let t = the thickness of each board = 3*2/3 cm = 0.78 inches We know that the number of boards * the thickness of each board = the total height. So we can express this in an equation as follows:   x * t = h   We know t and x, so enter them in: 9*0.78= 7.02 inch height = 7.02 inch height =17.83 cm

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