exam Maths Puzzle Numerical Ability

Anne and Nancy use a metal alloy that is 19.75% copper to make jewalry. How many ounces of an 18% alloy must be mixed with a 21% alloy to form 108 ounces of the desired alloy?

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Please help me sovle this extended word problem:
Cassandra has three skirts, five blouses, and ten pair of shoes, how many outfits does this make? Please help.
A zebra can run 15 mph faster than an elephant. A zebra can run 8 miles in the same time that an elephant can run 5 miles. Find the speed of each animal.