I would just use a simple ratio.
29/35 : 6/35
= 29 : 6
since 3 5/12 = 41/12
so x/(41/12) = 6/29
29x = 6(41/12) = 41/2
x = 41/58 quarts needed to finish the job
I have that 29/35 is painted and 6/35 is left to paint.
I also know that 3 5/12qts were used to paint the 29/35.
But I do not know how to do the work on how much paint will be needed to finish the 6/35 that is left to paint
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