It is 3.4286, approx.
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two sevenths simply means 2/7 so when someone asks what two sevenths of 12 are they mean (2/7)*12 = 24/7 which simplifies to 3 and two sevenths or in decimal form: 3.2857 (approximately).
2/21
It is -8/7
4/7 of 42=12
5/70 or0.0857142857