In a class of 60 students, 60% are girls. The average weight of the boys is 62…
20202020
In a class of 60 students, 60% are girls. The average weight of the boys is 62 kg and that of the girls is 58 kg. What is the average weight (in kg) of the whole class?
- A.
61.5
- B.
60
- C.
59.6
- D.
61.4
Attempted by 99 students.
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Correct answer: C
Given:
Total students = 60
Girls = 60% of the class
Boys = the remaining students
Average weight of boys = 62 kg
Average weight of girls = 58 kg
Step 1: Find the number of boys and girls
Girls = 60% of 60
= (60/100) × 60
= 36
Boys = 60 − 36
= 24
Step 2: Find the total weight of boys and girls
Total weight of boys = 24 × 62 = 1488 kg
Total weight of girls = 36 × 58 = 2088 kg
Step 3: Find the average weight of the whole class
Total weight of the class = 1488 + 2088 = 3576 kg
Average weight = Total weight ÷ Total students
= 3576 ÷ 60
= 59.6 kg
Hence, the average weight of the whole class is 59.6 kg.