A group of 3 numbers has an average of 17. The first two numbers are 12 and 19. What is the third number? 17 19 20 23 30
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Let the no. be x
Then 12+19+x/3=17
31+x/3=17
31+x=51
x=20
Then 12+19+x/3=17
31+x/3=17
31+x=51
x=20
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Answer:
23
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