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Answer:
Step-by-step explanation:
80 / 12 = 6 2/3, so a twelfth of 80 is 6 2/3.
Cement:
6 2/3 * 1 = 6 2/3
Sand:
6 2/3 * 3 = 18 6/3 = 20
Gravel:
6 2/3 * 4 = 24 8/3 = 26 2/3