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BECE Mathematics 2012 Paper
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© africaexams.com
Question : 29
Total: 40
A watch gains
1
1
2
minutes per hour. What is the total time gained from 12 noon to 12 midnight in a day?
9 minutes
15 minutes
18 minutes
36 minutes
Validate
Solution:
12 noon to 12 midnight is 12 hours
Change the mixed fraction of the minutes gained to improper fraction.
1
1
2
=
1
×
2
+
1
2
=
2
+
1
2
=
3
2
If 1 hour
=
3
2
minutes
12 hour
=
12
hour
×
3
2
minutes
÷
1
hour
=
6
×
3
minutes
=
18
minutes
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