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11 June, 23:28

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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  1. 12 June, 01:44
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    (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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