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An investor wishes to realize a return of 12 percent on a total of two investments

An investor wishes to realize a return of 12 percent on a total of two investments. If he has $10,000 invested at 10 percent, how much additional money should be invested at 16 percent?

A retail merchant invested $ 6500 in three kinds of cameras

A retail merchant invested $ 6500 in three kinds of cameras. The profit on the camera A was 25 percent; on the sales of camera B the profit was 12 percent; and there was a loss of 1 percent on the sales of camera C. if the merchant invested an equal amount in camera A and B, and the overall profit on the total investment was 14 percent, how much was invested in each kind of cameras?

 

Word problem on alloys

One alloy contains 80 percent gold (by weight) and another alloy contains 55 percent gold. How many grams of each alloy should be combined to make 40 g of an alloy that contains 70 percent gold?

 

Word problem about salt solutions

How many pounds of a 35 percent salt solution and how many pounds of a 14 salt solution should be combined so that 50 lb of a 20 percent salt solution are obtained?

Every freshman student at a particular collage is required to take an English aptitude test

Every freshman student at a particular collage is required to take an English aptitude test. A student who passes the examination enrolls in English Composition, and a student who fails the test must enroll in English Fundamentals. In a freshman class of 1240 student there are more student enrolled in English Fundamentals than in English Composition. However, if 30 more students had passed the test, each course would have the same enrollment. How any students are taking each course?

 

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