Question on: JAMB Mathematics - 2002
A
0.25
B
0.38
C
0.50
D
0.13
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Correct Option: A
80 = (30 - x) + x + 40 - x + 20
80 = 90 - x, x = 90 - 80 = 10
N (music only) = 30 - x = 30 - 10 = 20
P (music only) = (\frac{20}{80} = \frac{1}{4})
= 0.25
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