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Friday, August 18 2017 @ 07:49 AM CDT
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 problem sum - need help
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By: Strawberry (offline)  Saturday, June 09 2012 @ 08:43 AM CDT (Read 1359 times)  
Strawberry

There are 4 adults. Each time,two adults are weighed, giving a total of 6 readings, in kilograms as listed below.
103.5, 111,112.5,117,118,122
What is the average mass of the 4 adults

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By: echeewh (offline)  Saturday, June 09 2012 @ 03:06 PM CDT  
echeewh

Hi Strawberry,

Following pls find the worked solution:

Given 4 Adults, each Adult is weighed 3 times with another different Adult. Thus, giving the 6 readings.

Let the adults be A, B, C and D.

3A + 3B + 3C + 3D = Sum of all 6 readings
= 103.5 + 111 + 112.5 + 117 + 118 + 122
= 684 kg

A + B + C + D = 684 ÷ 3 = 228 ( Total weight of all 4 Adults )

Average weight of 4 Adults = 228 ÷ 4 = 57 kg

============================================

Do let me know if you already have the answerkey as it will be good to double confirm Smile

Cheers,
Edward

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By: Strawberry (offline)  Saturday, June 09 2012 @ 10:05 PM CDT  
Strawberry

Thanks.

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By: Strawberry (offline)  Friday, June 22 2012 @ 11:27 PM CDT  
Strawberry

Hi Edward,

I do not have the answer key. Will let you know when the question is marked.

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