1. John, Paul, and George can finish a job in 12, 16, and 19 hours respectively. John and Paul worked together for 4 hours. Paul got tired so George worked in place of him until the job is finished. How long did John work?

MATLAB: An Introduction with Applications
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1. John, Paul, and George can finish a job in 12, 16, and 19 hours respectively.
John and Paul worked together for 4 hours. Paul got tired so George worked in
place of him until the job is finished. How long did John work?

2. A container is filled with 70 liters which is 40% alcohol by volume. How much of
a mixture must be taken and then replaced with equal amount of water so that
the resulting solution is 30% alcohol by volume?

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