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A sequence is made up of four numbers. Each number is half of the previous number. The sum of the four numbers is 135 What is the first number in the sequence?

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let the 4 numbers be 8x, 4x, 2x, and x , (avoiding fractions using this definition)
8x+4x+2x+x = 135
15x = 135
x = 9

your numbers are 72, 36, 18, and 9

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