Book Maths Puzzle Percentage

jim is able to sell a hand-carved statue for $670 which was 35% profit over his coast. hoe much did the statue originally coast him.

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Acid problem Fran Tick knocks over the bottle of acid in the science lab. Her punishment is to mix up a new 1000ml bottle with 34%acid. She must do this by mixing concentrated aci a rectangular patio has a length of x+4 feet and a width of x-4 feet. If the area of the patio is 33 square feet, what are the dimensions of the patio?