Answer:
Timber=x/12
Explanation:
12 pieces long is x, if the length of each one is same, so the length of each one is x/12.
(x/12)
if 12 pieces combine to make x, [we know they are identical], each piece must be 1/12 of x [1/12·x = x/12]
(think of it like this: "x" length must be divided amongst 12 pieces, so, we divide x/ 12)
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