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Prince choudhary

· started a discussion

· 1 Months ago

wrong answer (Question:113317.0)

how iiird option is right

Knowledge Expert

· commented

· 1 Months ago

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

· started a discussion

· 1 Months ago

wrong answer (Question: 113317.0 )

ans. can be 30 as in ques diff. of age of boy and teacher is given not age of boys and teacher

Question:

Average age of a teacher and three students is 20 years. If all the three boys are of same age and the difference between the age of the boy and the teacher is 20 years. Then the age of the teacher is equal to. 

Options:
A) 25 years
B) 30 years
C) 35 years
D) 45 years
Solution:
Ans: (c) Let the age of students be x and that of teacher be y then according to given condition we have

3x + y = 4 × 20

i.e., 3x + y = 80 ............. (i)

and y - x = 20 ...............(ii)

\(\therefore\) Now solving (i) and (ii), we get x = 15

y = 20 + 15

y = 35 years

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