Two boxes average weight 78 lbs
Box B wweight 12 lbs more than box A
What is the weight of Box A?

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We'll help, but it won't be an instant, free answer. You must attempt to do the problem. So, post your answer and how you got it, and then we'll help.

X+(x+12) = 78
2x=66
x ==33 33+12=45 35+33=78