2011
Mathematics
JAMB
If x varies directly as square root of y and x = 81 when y = 9, Find x when y = 1(7/9)
A.
20(1/4)
B.
27
C.
2(1/4)
D.
36
Correct Answer: 36
Explanation
x α√y x = k√y 81 = k√9 k = 81/3 = 27 therefore, x = 27√y y = 1(7/9) = 16/9 x = 27 x √(16/9) = 27 x 4/3 dividing 27 by 3 = 9 x 4 = 36
x α√y x = k√y 81 = k√9 k = 81/3 = 27 therefore, x = 27√y y = 1(7/9) = 16/9 x = 27 x √(16/9) = 27 x 4/3 dividing 27 by 3 = 9 x 4 = 36THIS WEEK's
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