exam Maths Puzzle Numerical Ability

One person can devote 24 hours a week to a project and two others can each devote 30 hours a week to the same project. If the total project requires 420 hours to complete, how many weeks will it take?

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70) Cost of Material. A rectangular box with volume 320ft cubed is built with a square base and top. The cost is $1.50/ft.squared for the bottom, $2.50/ft.squared for the sides, and $1/ft.squared for the top. Let x=the length of the base, in feet. The price �earning ratio (P/E) of a company is the ratio of the market value of one share of the company�s outstanding common stocks to the earnings per share. If P/E increase by