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 By: Strawberry (offline)  Saturday, June 09 2012 @ 08:43 AM CDT (Read 1393 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

Regular Member

Registered: 01/31/09
Posts: 83

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

Hi Strawberry,

Following pls find the worked solution:

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

Cheers,
Edward

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Registered: 04/21/11
Posts: 627

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

Thanks.

Regular Member

Registered: 01/31/09
Posts: 83

 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.

Regular Member

Registered: 01/31/09
Posts: 83

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