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Three packets of nails weigh 850 g, 1.25kg and 950 g respectively. When a fourth bag is added the mean weight is 975 g. What was the weight of the fourth bag?

 Jan 10, 2020
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Note :  1.25kg  = 1250g

 

[ 850 + 1250 + 950   + W  ]  / 4 =    975

 

[3050 + W  ]  / 4  = 975                       multiply both sides by 4

 

3050 + W  = 3900        subtract  3050 from both sides

 

W =  850 g  =   weight of 4th bag

 

 

cool cool cool

 Jan 10, 2020

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