SOLUTION: The average of 3 numbers is 154. The first number is twice the second and the second number is twice the third. The first number is-
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Question 792873: The average of 3 numbers is 154. The first number is twice the second and the second number is twice the third. The first number is-
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The average of 3 numbers is 154. The first number is twice the second and the second number is twice the third.
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Equations:
(a+b+c)/3 = 154
a = 2b
b = 2c
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Rearrange:
a + b + c = 462
a = 2b
c = b/2
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Substitute for a and c and solve for "b":
2b + b + b/2 = 462
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(7/2)b = 462
b = 132
a = 2b = 264
c = b/2 = 66
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Cheers,
Stan H.
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The first number is-
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