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If y varies directly as the square root of x and y = 3 when...

Mathematics
JAMB 2010

If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64

  • A. 12
  • B. 6
  • C. 3
  • D. 5
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Correct Answer: Option B
Explanation

y ∝ √x
y = K√x
K = y/√x = 3/√16
= 3/4
y = 3/4√x
= 3/4√64 when x = 64
= 3/4 x 8/1
= 6

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995