three and one sixth plus one and one twelfth = 39/12
3 1/6 = [(6 * 3)+1]/6 = (18+1)/6 = 19/6
19/6 + 1/12
= (38 + 1)/12
= 39/12
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One fourth is three twelfths. So one twelfth plus three twelfths is four twelfths, which is also one third.
Seven and one twelfth
it's 2/3 (two thirds)
17/12 Is the answer.
7 15ths