Precal D Section 1'4

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Precal D Section 1.4

• Sample Problems

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Example 1 - Investments

• A total of 12,000 is invested in a savings and a
  checking account. The savings account has 2.5
  times as much money as the checking account. How
  much money is in each account?

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Example 2 - Interest

• Juan invested 20,000 in two accounts. One earns
  8 interest while the other earns 11 interest.
  How much should be invested in each if Juan earns
  1,900 in annual interest.

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Example 3 - Mixtures

• Sam is mixing cashews and peanuts. The cashews
  cost 3.29 per pound and the peanuts cost 1.28
  per pound. How much of each should be used to
  make a 50 pound mixture worth 1.99 per pound?

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Example 4 - Chemistry

• How much of a 60 acid solution should be mixed
  with a 40 acid solution to make 100 ml of a 48
  acid solution?

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Example 5 - Motion

• A speed boat can travel upstream from Welkerville
  to Cedarville and return in 4 hours. The
  distance between the two towns is 32 miles. If
  the speed of the current is 4 mph, what is the
  speed of the boat.

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Example 6 - Work

• Peter can paint the room in 8 hours. Joan can
  paint the room in 6 hours. How long will it take
  to paint the room working together?