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
546 views
in Mathematics by (240k points)
closed by
The average weight of A, B and C is 65 kg. If the average weight of A and B is 63.5 kg, and the average weight of A and C is 67.5 kg, then the weight of A (in kg) is:
1. 67
2. 65
3. 68
4. 60

1 Answer

0 votes
by (238k points)
selected by
 
Best answer
Correct Answer - Option 1 : 67

Given:

Average of A, B and C = 65 kg

Average of A and B = 63.5 kg

Average of A and C = 67.5 kg

Formula used:

Sum of all observations = Average × Total number of observations

Calculation:

A + B + C = 65 × 3 = 195 kg      ---- (1)

A + B = 63.5 × 2 = 127 kg      ---- (2)

Subtracting (2) from (1), we'll get

A + B + C – (A + B) = 195 – 127

⇒ C = 68 kg

Also, A + C = 67.5 × 2 = 135

⇒ A + 68 = 135

⇒ A = 135 – 68

⇒ 67 kg

∴ Weight of A is 67 kg

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

...