There are 50 students in a class. their average weight is 45 kg. when one student leaves the class the average weight reduces by 100g. what is the weight of the student who left the class ?
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(x1 + X2 +x3 +......... x50) / 50 = 45
=> x1 + x2 + x3 +..........+ x50 = 2250 ------(1)
According to second condition,
( x1 + X2 + x3 +....... + x 49) / 49 = ( 45 - 0.100)
=> x1 + X2 + x3 +....... + x 49 = 44.9 × 49
=> x1 + X2 + x3 +....... + x 49 = 2200.1 ------(2)
On subtracting equation 2 from 1, we get
x50 = 2250 - 2200.1
=> x50 = 49.9 kg
Weight of student who left the class = 49.9 kg
=> x1 + x2 + x3 +..........+ x50 = 2250 ------(1)
According to second condition,
( x1 + X2 + x3 +....... + x 49) / 49 = ( 45 - 0.100)
=> x1 + X2 + x3 +....... + x 49 = 44.9 × 49
=> x1 + X2 + x3 +....... + x 49 = 2200.1 ------(2)
On subtracting equation 2 from 1, we get
x50 = 2250 - 2200.1
=> x50 = 49.9 kg
Weight of student who left the class = 49.9 kg
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