8. 72 kg of dynamite contains 54 kg Of
potassium nitrate and 10.8 kg of charcoal.
The remaining is sulphur. Calculate the
percentage of sulphur.
In an examination, 82% students passed in
science and 75% students in mathematics. If
8% students failed in both the subjects, find
the following:
a. The percentage of failed students in
mathematics or science or both.
Answers
Answer:
1) answer is 10% ......
Answer:
Given data:
Dynamite is 72kg
It contains 54kg of potassium nitrate
and 10.8kg if charcoal
The remaining is sulphur.
To find:
Percentage of sulphur = ?
Solution:
Dynamite = KNO3 + Charcoal + Sulphur
72 = 54 + 10.8 + Sulphur
Therefore, sulphur is 7.2kg
Percentage of sulphur in dynamite
= mass of sulphur × 100
mass of dynamite
= 7.2 × 100
72
= 720
72
= 10%
Therefore, 10% of sulphur is present in dynamite. ______________________________________
Given data:
In an examination,
82% students passed in science and
75% students passed in mathematics
8% students failed in both the subjects
To find:
The percentage of failed students in
mathematics or science or both=?
Solution:
Percentage of failed students in
mathematics = 100 - 75 = 25%
Percentage of failed students in science = 100 - 82 = 18%
Percentage of percentage of failed students in both = 8%
______________________________________
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