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What approximate value should come in place of the question mark (?) in the following equation?
(Note: You are not expected to calculate the exact value)
`(49.84)/(sqrt(5.2))xx18.12xxsqrt(?)`

A

34

B

26

C

90

D

64

Text Solution

Verified by Experts

The correct Answer is:
D
Let the answer be y
`(49.84)/(sqrt(5.2))xx18.12=62.21xxsqrt(y)`
By approximation,
`(50)/(sqrt(4))xx20=60xxsqrt(y)`
`(50)/(2)xx20=60xxsqrt(y)`
`500=60xxsqrt(y)`
`sqrt(y)~~8`
Squaring both sides
`y~~64`
Hence the answer is option (d).
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