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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-RATIO, PROPORTION AND UNITARY METHOD-All Questions
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