Africa Exams
Where Preparation Meets Success
Home
Botswana
Botswana PSLE Papers
Botswana JCE Papers
Botswana BGCSE Papers
Ghana
Ghana BECE Exams
Kenya
Kenya KCPE Papers
Kenya KCSE Papers
Kenya KASNEB Papers
Nigeria
WAEC Exams
JAMB Exams
Rwanda
Rwanda Primary Papers
Rwanda Secondary Papers
Uganda
Uganda PLE Papers
Uganda UCE Papers
Uganda UACE Papers
Certifications
Technical
Cloud Tech Certifications
Security Tech Certifications
Management
IT Infrastructure
More
About
Contact Us
Our Apps
Privacy
+
-
Test Index
WAEC Mathematics 2011 Paper
Show Para
Hide Para
Share question:
© africaexams.com
Question : 33
Total: 47
in a quiz competition, a student answers n questions correctly and was given D(n + 50) for each question correctly answered. If he gets D600.00 altogether, how many questions did he answer correctly?
18
15
12
10
Validate
Solution:
let the number of question = n
n(n + 50) = 600
n
2
+ 50n - 600 - 0 by quadratic formular
x =
b
±
√
b
2
−
4
a
c
2
n =
−
50
±
√
50
2
−
4
(
1
)
(
−
600
)
2
(
1
)
=
−
50
±
√
4900
2
=
−
50
+
70
2
=
20
2
= 10
© africaexams.com
Go to Question:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Prev Question
Next Question
