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?
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.
