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BECE Mathematics 2016 Paper
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© africaexams.com
Question : 29
Total: 40
The mean of three number is 12. If two of the numbers are 14 and 16, find the third number.
6
12
30
36
Validate
Solution:
Mean
=
Sum of numbers
Number of numbers
Let
x
=
the third number.
Sum of the numbers
=
14
+
16
+
x
Sum of the numbers
=
30
+
x
Number of numbers
=
3
Mean
=
30
+
x
3
But mean
=
12
12
=
30
+
x
3
Get rid of the fraction by multiplying both sides of the equation by the denominator 3
12
×
3
=
30
+
x
36
=
30
+
x
36
−
30
=
x
6
=
x
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