exam Maths Puzzle Numerical Ability

Mr. Scrooge and Mr. Marner believed in saving money. At the end of 3 years, Mr.Scrooge had saved no less than two thirds what Mr.Marner had saved. If Mr. Marner saved $15.00 per weel, what is the least amount of money that Mr. Scrooge saved?

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can you please help me to understand this problem.

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