2006 - WAEC Mathematics Past Questions and Answers - page 2
11
The ratio of boys to girls in a class is 5:3. Find the probability of selecting at random, a girl from the class
A
\(\frac{1}{8}\)
B
\(\frac{1}{3}\)
C
\(\frac{3}{8}\)
D
\(\frac{3}{5}\)
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12
\(\begin{array}{c|c} x & 1 & 4 & p \ \hline y & 0.5 & 1 & 2.5\end{array}\). The table above satisfies the relation y = k\(\sqrt{x}\), where k is a positive constant. Find the value of K.
A
0.5
B
1
C
1.5
D
2
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13
\(\begin{array}{c|c} x & 1 & 4 & p \ \hline y & 0.5 & 1 & 2.5\end{array}\). The table below satisfies the relation y - k\(\sqrt{x}\), where k is a positive constant. Find the value of P,
A
2
B
4
C
10
D
25
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14
What must be added to x2 - 3x to make it a perfect square?
A
\(\frac{9}{4}\)
B
\(\frac{9}{2}\)
C
6
D
9
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15
Given that (2x - 1)(x + 5) = 2x2 - mx - 5, what is the value of m
A
11
B
5
C
-9
D
-10
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16
What is the place value of 9 in the number 3.0492?
A
\(\frac{9}{10000}\)
B
\(\frac{9}{1000}\)
C
\(\frac{9}{100}\)
D
\(\frac{9}{10}\)
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17
If the simple interest on a sum of money invested at 3% per annum for 2\(\frac{1}{2}\) years is N123, find the principal.
A
N676.50
B
N820
C
N1,640
D
N4,920
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18
A machine valued at N20,000 depreciates by 10% every year. What will be the value of the machine at the end of two years?
A
N16,200
B
N1,4,200
C
12,000
D
8000.
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19
If 2x + y = 10, and y \(\neq\) 0, which of the following is not a possible value of x?
A
4
B
5
C
8
D
10
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20
If x + y = 12 and 3x - y = 20, find the value of 2x - y
A
8
B
10
C
12
D
15
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