The average weight of a class of 39 student is 40kg. When a new student is admitted to the class, the average decrease by 200g. find the weight of the new student.
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Answer:
32 Kg
Step-by-step explanation:
Total weight of whole class = 39 * 40kg = 1560 Kg
Let new student weight be = X kg
If new student adds to whole class , the total members of class = 40
The total weight of whole class after new student being admitted = 1560 + X kg. -> LHS
The average decreased = 200g = 0.2 kg
The new average = 40 - 0.2 = 39.8
The new total weight = 40 * 39.8 = 1592 kg. -> RHS
Equating LHS and RHS
1560 + X = 1592
X = 1592 - 1560
X = 32 Kg
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