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There are 25 students in the class and 60% of them are boys. How many boys are there?
- a)5
- b)10
- c)15
- d)25
- e)50
Correct answer is option 'E'. Can you explain this answer?
Verified Answer
There are 25 students in the class and 60% of them are boys. How many ...
There are a number of ways to work the math on this.
60% = 60/100 = 3/5
3/5 * 25 or (3 * 25)/5 =
75/5 = 15
So the exact number is 15 boys, but the way the question is worded, it could be a trick question. It says 60% are boys, but does not specify that the other 40% are all not boys. In that case the answer would be:
15 <= number of boys <= 25
Most Upvoted Answer
There are 25 students in the class and 60% of them are boys. How many ...
Given information:
- Number of students in a class = 25
- 40% of the students are girls
To find:
- How many more girls must be added in the class such that the percentage of girls is double the current percentage?
Solution:
Let's first find the current number of girls in the class:
40% of 25 = (40/100) x 25 = 10 girls
Let's assume that 'x' more girls need to be added to the class to make the percentage of girls double.
So, the new number of girls in the class will be 10 + x.
The total number of students in the class after adding 'x' girls will be 25 + x.
According to the question, the new percentage of girls should be double the current percentage.
So, the new percentage of girls will be:
[(10 + x) / (25 + x)] x 100 = 2 x 40
Simplifying this equation, we get:
(10 + x) / (25 + x) = 4/5
50 + 5x = 100 + 4x
x = 50
Therefore, 50 more girls need to be added to the class to make the percentage of girls double.
Answer: Option (E)
- Number of students in a class = 25
- 40% of the students are girls
To find:
- How many more girls must be added in the class such that the percentage of girls is double the current percentage?
Solution:
Let's first find the current number of girls in the class:
40% of 25 = (40/100) x 25 = 10 girls
Let's assume that 'x' more girls need to be added to the class to make the percentage of girls double.
So, the new number of girls in the class will be 10 + x.
The total number of students in the class after adding 'x' girls will be 25 + x.
According to the question, the new percentage of girls should be double the current percentage.
So, the new percentage of girls will be:
[(10 + x) / (25 + x)] x 100 = 2 x 40
Simplifying this equation, we get:
(10 + x) / (25 + x) = 4/5
50 + 5x = 100 + 4x
x = 50
Therefore, 50 more girls need to be added to the class to make the percentage of girls double.
Answer: Option (E)
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Community Answer
There are 25 students in the class and 60% of them are boys. How many ...
C)15
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