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Aditi Kaushik

· started a discussion

· 1 Months ago

give explanation (Question: 129355.2 )

plz explain in detail

Question:

DIRECTIONS: Answer the questions on the basis of the information given below.


In class of 84 students the boys and girls are in the ratio 5 : 7 respectively. Among the girls 7 can speak Hindi and English. 50 per cent of total students can speak only Hindi. The ratio between the number of students speaking only Hindi and only English is 21: 16 respectively. The ratio between the number of boys and girls speaking English only is 3 : 5. The number of boys is 75% of the number of girls is speaking only hindi.

What is the ratio between the number of boys and girls respectively who speak Hindi only?

Options:
A) 10 : 11
B) 11 : 10
C) 2 : 5
D) Cannot be determined
E) None of these
Solution:

Ans: (a) Number of boys in the class = \(\cfrac{5}{12}\times 84 = 35 \)

 

Number of girls in the class = \(\cfrac{7}{12}\times 84 = 49 \)

Number of girls speaking Hindi and English both = 7

50% i.e., 42 students speak Hindi alone Number of students who speak English only = 32, as the ratio of students speaking Hindi and English only = 21: 16

Number of girls who speak English only = 20 Number of boys who speak English only = 12 Number of girls who speak Hindi only = 22 Number of boys who speak both languages

= 35 - 32 = 3.

Knowledge Expert

· commented

· 1 Months ago

Dear student,
Please read the solution properly.
Keep learning,
Team TR

Bhanu Pratap Singh

· commented

· 1 Months ago

According to question ,agar only hindi speak krne wale boys ke number, only hindi speak krne wali girls ka 75% hai... to yaha 22 girls only hindi ki hai or 20 boys only hindi ke... 20 kaha 22 ka 75% hai... please clear it???

paramasivam

· commented

· 1 Months ago

Friends English speaking boys are 12 and girls are 20.
And the students who are speaking both languages are 10(7girls and 3boys).
so remaining 20 boys and 22 girls.
20:22
so answer is 10:11.
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