34. A woman has a certain amount of money invested. If she had $6000 more invested at a rate 1 percent lower, she would have the same yearly income from the investment. Furthermore, if she had $4500 less invested at a rate 1 percent higher, her, her yearly income from the investment would also be the same. How much does she have invested, and at what rate is it invested?
35. A chemist has two acid solutions. One contains 15 percent acid and the other contains 6 percent acid. How many cubic centimeters of each solution should be used to obtain 400cm3 of a solution that is 9 percent acid?
36. A tank contains a mixture of insect spray and water in which there are 5 gal of insect spray and 25 gal of water. A second tank also contains 5 gal of spray but only 15 gal of water. If it is desired to have 7.5 gal of a mixture of which 20 percent is spray, how many gallons should be taken from each tank?
2007-11-19
23:20:06
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1 answers
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asked by
squall_cloud
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Mathematics