SOLUTION: Two boxes contained 155 lb of flour. If you take 20 lb from the first and add it to the second, the first box will contain 12/19 of what is now in the second. What amount of flour

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Question 1134419: Two boxes contained 155 lb of flour. If you take 20 lb from the first and add it to the second, the first box will contain 12/19 of what is now in the second. What amount of flour was originally in each box?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!

Answer by ikleyn(52776)   (Show Source): You can put this solution on YOUR website!
.

            You can solve it  MENTALLY,  without using equations. 


After exchange, the total mass of 155 lb consists of 12 + 19 = 31 equal parts.


Each part is then   = 5 lb.


So, after exchange, there are  12*5 = 60 lb in the first box and  19*5 = 95 lb in the second box.


Hence, BEFORE exchange, there were 60+20 = 80 lb in the first box and 95-20 = 75 lb in the second box.    ANSWER


Solved.


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