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The average of 20,70 and x is 40. If the average of 20,70, x and y is 50, then y=

a. 30
b. 60
c. 70
d. 80
e. 100

  • math -

    20 + 70 + x = 120
    x = 30

    120 + y = 200
    y = 80

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