book Maths Puzzle Numerical Ability

(3x+7x5+7)+(5x5+5+7x)

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book Other Question

A Metra commuter train leaves Union STation in Chicago at 12 noon. Two hours later, an Amtrak train leaves on the same track, traveling at an average speed that is 50 miles per ho Jim is able to sell a hand-carved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him?