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The average weight of 20 students is 60kg.If the weight of the teacher is added, average is increased by 2kg.What was the teacher’s weight ?
- a)100kg
- b)110kg
- c)120kg
- d)130kg
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
The average weight of 20 students is 60kg.If the weight of the teacher...
Option ..( c)
The average weight of 20 students is 60 kg
Therfore, the total weight of 20 students = 20*60 = 1200 kg
When the teacher is added then average is increased by 2 kg
=> Average weight of 20 students and 1 teacher become 62 kg.
=> Total weight of 20 students and 1 teacher :-
21 * 62 = 1302 kg
The required weight of teacher:-
=> [ 1302 - 1200] kg = 102 kg
So., the right answer is 102 kg.
Most Upvoted Answer
The average weight of 20 students is 60kg.If the weight of the teacher...
The average weight of 20 students = 60 kg ,
so the total weight of 20 students be = 20×60=1200 kg,
teacher is added so now., no. of people will be 21 and the average, weight increased by 2 kg so new average weight becomes 62 kg,
so total weight including teacher will be = 21× 62 = 1302 kg ,
so now weight of teacher will be = 1302 - 1200 = 102Kg ,
in here this optopn c is mistyped as 120 but the answer will be 102 kg.
so the total weight of 20 students be = 20×60=1200 kg,
teacher is added so now., no. of people will be 21 and the average, weight increased by 2 kg so new average weight becomes 62 kg,
so total weight including teacher will be = 21× 62 = 1302 kg ,
so now weight of teacher will be = 1302 - 1200 = 102Kg ,
in here this optopn c is mistyped as 120 but the answer will be 102 kg.
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Community Answer
The average weight of 20 students is 60kg.If the weight of the teacher...
's weight?
Let's first use the formula for calculating average:
Average = (Sum of all values) / (Number of values)
We know that the average weight of 20 students is 60kg, so:
Sum of students' weights = 20 x 60 = 1200kg
Now, let's add the weight of the teacher and see how the average changes:
New average = (Sum of all values) / (Number of values + 1)
We know that the new average is 2kg more than the previous average, so:
New average = 60 + 2 = 62kg
We can plug this into the formula and solve for the sum of all values:
62 = (1200 + Teacher's weight) / 21
Multiplying both sides by 21:
1302 = 1200 + Teacher's weight
Subtracting 1200 from both sides:
Teacher's weight = 102kg
Therefore, the teacher's weight was 102kg.
Let's first use the formula for calculating average:
Average = (Sum of all values) / (Number of values)
We know that the average weight of 20 students is 60kg, so:
Sum of students' weights = 20 x 60 = 1200kg
Now, let's add the weight of the teacher and see how the average changes:
New average = (Sum of all values) / (Number of values + 1)
We know that the new average is 2kg more than the previous average, so:
New average = 60 + 2 = 62kg
We can plug this into the formula and solve for the sum of all values:
62 = (1200 + Teacher's weight) / 21
Multiplying both sides by 21:
1302 = 1200 + Teacher's weight
Subtracting 1200 from both sides:
Teacher's weight = 102kg
Therefore, the teacher's weight was 102kg.
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The average weight of 20 students is 60kg.If the weight of the teacher is added, average is increased by 2kg.What was the teacher’s weight ?a)100kgb)110kgc)120kgd)130kgCorrect answer is option 'C'. Can you explain this answer?
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