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Given that x+y+z=15 when a ,x ,y ,z ,b a...

Given that `x+y+z=15 when a ,x ,y ,z ,b` are in A.P. and `1/x+1/y+1/z=5/3w h e na ,x ,y ,z ,b` are in H.P. Then
(i) G.M. of `a and b` is 3
(ii) One possible value of `a+2b` is 11
(iii) A.M. of `a and b` is 6
(iv) Greatest value of `a-b` is 8

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