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If 6**9-4=58 and 3**9-7=34, then in expr...

If `6**9-4=58` and `3**9-7=34`, then in expression `A**4-9=91`, what is the value of 'A'?

A

6.5

B

17.5

C

20.5

D

30.5

Text Solution

Verified by Experts

The correct Answer is:
C
`6**9-4=58`
`rArr 6xx9+4=58`
`[ ** rArr xx and -rArr +]`
`3**9-7=34`
`rArr 3xx9+7=34`
therefore,
`a**4-9=91`
`rArr Axx4+9=91`
`rArr Axx4=91-9=82`
`rArr A=(82)/(4)=20.5`
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