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In a Joint family of 4 males and some female members, all members are working and the average monthly income per head is Rs.21750; while the average monthly income of male members is Rs.24000 per head and for female members, it is Rs.18750 per head. The number of female members in the family is:
  • a)
    4
  • b)
    3
  • c)
    7
  • d)
    5
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a Joint family of 4 males and some female members, all members are ...
According to the given information,
Number of male members = 4
Let the number of female members be y.
We know that, Average = Sum of all observations/Number of observations
The average monthly income of male members is Rs.24000 per head
∴ 24000 = Total monthly income of males/4
⇒ Total monthly income of males = 24000 × 4 = 96000
The average monthly income of female members is Rs.18750 per head
∴ 18750 = Total monthly income of females/y
⇒ Total monthly income of females = 18750y
Now, total average monthly income = (Income of males + Income of females)/(males + females)
⇒ 87000 + 21750y = 96000 + 18750y
⇒ 3000y = 9000
⇒ y = 3
Hence, the number of female members is 3.
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Most Upvoted Answer
In a Joint family of 4 males and some female members, all members are ...
Calculation:

Let the number of male members be M and number of female members be F
Given:
Total number of members = 4 (Males) + F (Females)
Total average monthly income = Rs. 21750
Average monthly income per head = Total average monthly income / Total number of members
Therefore,
21750 = (24000 * M + 18750 * F) / (4 + F)
24000M + 18750F = 21750 * (4 + F)
24000M + 18750F = 87000 + 21750F
24000M - 3000F = 87000

Now, we have to find the number of female members in the family

Solving the equation:
From the equation 24000M - 3000F = 87000
We know that M = 4 (as there are 4 male members)
Substitute M = 4 into the equation:
24000 * 4 - 3000F = 87000
96000 - 3000F = 87000
-3000F = -9000
F = 3
Therefore, the number of female members in the family is 3.
So, the correct answer is option B) 3.
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In a Joint family of 4 males and some female members, all members are working and the average monthly income per head is Rs.21750; while the average monthly income of male members is Rs.24000 per head and for female members, it is Rs.18750 per head. The number of female members in the family is:a)4b)3c)7d)5Correct answer is option 'B'. Can you explain this answer?
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In a Joint family of 4 males and some female members, all members are working and the average monthly income per head is Rs.21750; while the average monthly income of male members is Rs.24000 per head and for female members, it is Rs.18750 per head. The number of female members in the family is:a)4b)3c)7d)5Correct answer is option 'B'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about In a Joint family of 4 males and some female members, all members are working and the average monthly income per head is Rs.21750; while the average monthly income of male members is Rs.24000 per head and for female members, it is Rs.18750 per head. The number of female members in the family is:a)4b)3c)7d)5Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a Joint family of 4 males and some female members, all members are working and the average monthly income per head is Rs.21750; while the average monthly income of male members is Rs.24000 per head and for female members, it is Rs.18750 per head. The number of female members in the family is:a)4b)3c)7d)5Correct answer is option 'B'. Can you explain this answer?.
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