book Maths Puzzle Numerical Ability

The sum of two numbers is 23. Twice the greater number added to three times the smaller number is 57.

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You propose to build a space ship that allows the entire population of the United States (280 milliom) to leave the earth. Your plans allocate an average space of 1,000(=10*10*10) I am having more problems i understand now the last one i submitted but i have TWO problems i cant understand
here is one
During one week Dow Jones Industrial average, the most