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Some equations are solved on the basis o...

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
`4xx5=42`,
`5xx6=56`,
`6xx7=72`
`7xx8=?`

A

84

B

90

C

92

D

102

Text Solution

Verified by Experts

The correct Answer is:
B
`4xx5=42`
`implies(4+2)xx(5+2)=42`
`implies6xx7=42`
`5xx6=56`
`=(5+2)xx(6+2)=56`
`implies7xx8=56`
`6xx7=72`
`implies(6+2)xx(7+2)=72`
`implies8xx9=72`
Similarly,
`7xx8`
`implies(7+2)xx(8+2)`
`implies9xx10=90`
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