maths

Leila has a number of identical equilateral triangle shaped tiles. How many must she put together in a row (edge to edge) to create a shape which has a perimeter ten times that of a single tile?

Answer = 28
Thanks to anyone who helps

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asked by Fred
  1. draw it
    the ends need 2 s
    the top need n
    the requirement is 10 * 3s = 30 s
    so
    2 s + n s = 30 s
    n = 30 -2

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    posted by Damon
  2. I mean top and bottom need n

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    posted by Damon

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