In the diagram, MN is parallel to QR. If the areas of triangle PMN and trapezium MQRN are in the ratio 9:16, find the value of the ratio MN :QR.
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It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers.
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Great Depression: Black
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