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Answers
1) Total No.of students=150
No.of students absent =25
No.of students present=125
Percentage of students absent=(25/150)×100‰
=50/3‰
=16.67‰(approx.)
percentage of students present=(125/150)×100‰
=250/3 ‰
=83.33 ‰(approx.)
2) Total number of voters in the constituency =12000
% voters who voted =60%
Therefore,
Number of people who voted =12000× 60/100
=7200
3) Given:
A local cricket team played 20 matches in one season.
If it won 25% of them and lost rest. how many matches did it loose?
Solution:
Total no of matches = 20,
Win percentage = 25%.
Therefore 25% of 20 = 5
The number of matches lost = 20 – 5 = 15
Result:
The number of matches lost is 15.
4)In 1 gram of gold there is 0.25 grams of silver and 0.05 grams of copper.
So, The amount of gold in the mixture is
G = 1 - ( 0.25 + 0.5 )
G = 1 - 0.3
G = 0.7
So, There is 0.7 gram of gold, 0.25 grams of silver and 0.05 grams of copper.
The amount in percentage is
G% = 0.7 × 100 =70%
C% = 0.05 × 100= 5%
S% = 0.25 × 100 = 25%
Therefore, The percentage of gold, silver and copper in every gram of gold is 70%,25% and 5%.
5) Let the number be x
Then 40% of x = 800
40/100 × x = 800
4/10x = 800
x = 200
So the required answer is 2000
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