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The mean proportional of a\ a n d\ b is ...

The mean proportional of `a\ a n d\ b` is 10 and the value of `a` is four times the value of `bdot` the value of `a+b(a >0, b >0)` is
(a)20
(b) 25
(c)101
(d) 29

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RD SHARMA ENGLISH-RATIO AND PROPORTION-All Questions
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  10. The mean proportional of a\ a n d\ b is 10 and the value of a is four ...

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