self Maths Puzzle

The product of two numbers a and b equals one-quarter their average. What is a in terms of b?

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self Other Question

An old man distributed his estate worth x dollars to his three sons Allen, Tommy, and Peter. Whoreceived the smallest part of the estate?
(1)Allen got 4/5 of what Tommy got and 3/5 of what Peter got.
(2)Peter got 5/4 of what Tommy got and Tommy got 100 dollars more than what Allen got.
What is the value of the 201st
term of asequence if the first term of the sequence is2 and each successive term is 4 more thanthe term immediately preceding it?