A. A board is 20 feet long. It is going to be cut into three pieces. The longest piece is 4 times as long as the shortest. The middle piece is 2 feet longer then the shortest piece. How long is each piece?

Alright so this is what I have so far.

A = Unknown

B = A+2

C = A*4

A+B+C=20

I have figured most numbers that might work.. but I am guessing it is a decimal number, and I would rather not guess and get it right.. I want to understand how this problem might work. x.x I was wondering if someone might help me with that?

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B. There are two barrels of salt solution. The first barrel is a 20% solution. The second barrel is a 40% solution.

I: The Second barrel has 42 gallons. How much salt is in the barrel?

II: You add the contents of the first barrel to the second barrel. The resulting solution has a concentration of 35%. How many gallons were there in the first Barrel?

This one.. I have no clue where to even start.. I am assuming you eventually would have to make the 20/40% into decimals but aside from that, it is up in the air..

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C. You are buying a $220,000 home and must place a 20% down payment. How much is the down payment.

Answer: I made 20% into .2 decimal form and simply multiplied it into $220,000 getting a solution of $44,000?

20% is 1/5 of 100% so to check this I took (44,000 x 4) and got the base. I am pretty confident this one is right.

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D. Your friend tells you she went to a sale that gave her 30% off. She says that she saved $50. How much was her total purchase?

I want to approach this one like I did the last one..? Is there any information you can give me concerning it. I figure I will have to turn the 30% into .3 decimal but I am not sure what to do with it then. );