Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
458 views
in Aptitude by (106k points)
closed by
Average age of 20 students is 21 years. Two students leave the group and one new student joins the group. The average now becomes 20 years. If age of one is 26 years and the one who joined is 20 years, then what is the age of other student who left ?
1. 10
2. 11
3. 13
4. 14

1 Answer

0 votes
by (103k points)
selected by
 
Best answer
Correct Answer - Option 4 : 14

Given:

Average age of 20 students is 21 years. Two students leave the group and one new student joins the group. The average now becomes 20 years. If age of one is 26 years and the one who joined is 20 years, then what is the age of other student who left ?

Concept used:

Average

Calculation:

Average age of 20 students is 21 

sum = 20 × 21 = 420 years

Two students leave the group and one student joins

Total students = 19

Sum of age of 19 students = 19 × 20 = 380 years

Student left = A + B →  420 - 380 = 40

Age of one of those is 26 years

So the age of the other is 40 - 26 = 14 years.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...