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In a certain sequence of numbers, each number after the first is 3 less than twice the previous.  If the third number in the sequence is 51, what is the first number of the sequence? 

 Oct 23, 2021
 #1
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15-27-51

 Oct 23, 2021
 #2
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In a certain sequence of numbers, each number after the first is 3 less than twice the previous.  If the third number in the sequence is 51, what is the first number of the sequence?     

 

To solve this problem, add 3 to 51 to get 54, then halve it to get 27.  

                           then add 3 to 27 to get 30, then halve it to get 15.  

 Oct 23, 2021

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