When a student weighing 54 Kg left a class, the average weight of the remaining 39 students increased by 250g. What is the average weight of the remaining 39 students?

64 Kg

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65 Kg

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66 Kg

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69 Kg

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Solution

The correct option is A 64 Kg
Let the average weight of 40 students be x Kg
When the student left, average weight of the class became (x+0.25)Kg
So, $\frac{39 (x + 0.25) + 54}{40} = x$
Solving, x=63.75 Kg
Average weight of the 39 students = 64 Kg.

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When a student weighing 54 Kg left a class, the average weight of the remaining 39 students increased by 250g. What is the average weight of the remaining 39 students?

The correct option is A 64 Kg Let the average weight of 40 students be x Kg When the student left, average weight of the class became (x+0.25)Kg So, 39(x+0.25)+5440=x Solving, x=63.75 Kg Average weight of the 39 students = 64 Kg.

The correct option is A 64 Kg
Let the average weight of 40 students be x Kg
When the student left, average weight of the class became (x+0.25)Kg
So, $\frac{39 (x + 0.25) + 54}{40} = x$
Solving, x=63.75 Kg
Average weight of the 39 students = 64 Kg.