A website Maths Puzzle Numerical Ability Simple & Compound Interest

If x,y,z are three sum of money such that y is the simple interest on x, y is the simple interest on y for the same time and the same rate of interest, then we have-
x2=yz
y2=xy
z2=xy
xyz=1
x=2y

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A website Other Question

Complete the following series:

1, 4, 5, 6, 7, 9, 11, __?
Using only the digits from 0 to 6 only, how many 5 digit codes can be constructed, if the first digit cannot be 4 and no digit is used more than once?