
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:
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
Cheers,
Edward

Active Member
Registered: 04/21/11 Posts: 627





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



Strawberry 

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



