14 karat is 7/12 pure gold and 5/12 other metals. how much pure gold is in 4 ounces of 14-karat gold

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?

Which shows how to solve the equation 3/4x=6 for x in one step?