exam Maths Puzzle Numerical Ability

Twenty men did 1/4 of a job in eight days. Then it became necessay to complete the job in the next five days. How many additional men were added to the crew of twenty to accomplish this task?

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exam Other Question

in selecting a piece of angle iron for a certain applicatioin, you know that you must have no more cross-sectional area than 60 squared cm , else the angle iron will weigh too much How do I rewrite each equation as a function of x.

-3x + 4y = 11