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Find the value of y if \(402_y = 102_{ten}\)

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Mathematics JAMB 2023

Find the value of y if \(402_y = 102_{ten}\)

  • 4
  • 2
  • 5 checkmark
  • 3

The correct answer is: C

Explanation

\(402_y = 102_ten\)

β‡’ 4 x y\(^2\) + 0 x y\(^1\) + 2 x y\(^0\) = 102

β‡’ 4y\(^2\) + 0 + 2 x 1 = 102

β‡’ 4y\(^2\) + 2 = 102

β‡’ 4y\(^2\) = 102 - 2

β‡’ 4y\(^2\) = 100

β‡’ y\(^2 = \frac {100}{4}\)

β‡’ y\(^2\) = 25

∴ y = √25 = 5

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