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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 AND PROPORTION-All Questions
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  8. If x : y=1:1,\ t h e n\ (3x+4y)/(5x+6y)= (a) 7/(11) (b) (17)/(11) (c)...

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  9. If a : b=2:5, then (3a+2b)/(4a+b)= (a) (16)/(13) (b) (13)/(16) (c) (2...

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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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