exam Maths Puzzle Numerical Ability

2. Investing: Stocks and Bonds Do bonds reduce the overall risk of an investment portfolio?
Let x be a random variable representing annual percent return for Vanguard
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Ride the peaks. Smith bicycled 45 miles going east from Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one half hour longer than Smith�s. How fast was each one traveling.
soybean meal is 12% protein; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get 240lb mixture that is 10% protein