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OpenStudy (anonymous):
The average (arithmetic mean) of 5,10,15 and x is 20..What is the x ? How do I solve this question?
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OpenStudy (littlebird):
\[\frac{ 5+10+15 +x}{ 4 }\]=20
OpenStudy (littlebird):
\[\frac{ 30+x }{ 4 }=20\]
OpenStudy (littlebird):
30+x=80
OpenStudy (littlebird):
X=50
OpenStudy (littlebird):
Another way you could have done it....
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OpenStudy (littlebird):
20x4=80
OpenStudy (littlebird):
80-15-10-5=50
OpenStudy (anonymous):
Got it! Thanks.
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