SilvaFigart SilvaFigart

21-04-2014
Mathematics

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The average IQ of 4 people is 110. If three of these people each have an IQ of 105, what is the IQ of the fourth person ?

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deathstrike001 deathstrike001

21-04-2014

(105+105+105+x)/4=110
multiply both sides by 4
105+105+105+x=440
315+x=440
x=125

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