ANSWERS: 5
  • YOu're 46 years old.
    • Black Mystique
      I just used a spreadsheet listing a cents for each year and the added created a column for the accumulation
    • we are dough
  • 1-13-2017 What you are talking about is adding all numbers from 1 to something. Let's take 1 to 100 to illustrate the method. 1 + 100 = 101 and 2 + 99 = 101 and so on for 50 additions. Then 50 x 101 = 5050. So we try 1 to 50: 25 x 51 = 1275. Let's try 40 additions: 20 x 41 = 820. We're getting close: the answer is between 50 and 40. Let's try 46: 23 x 47 = 1081. CHA-CHING! I hope you can see that this only works for sequences from 1 to an even number, but it can be adapted to other sequences.
    • Miagirl304
      So would the answer be 46 or 47?
  • Very old and very boring......
  • The sum of the first n nonzero integers is (n+1)*n/2 Source: http://www.9math.com/book/sum-first-n-natural-numbers - So we have to solve for n: 1081 = (n+1)*n/2 or 2162 = (n+1)*n - please notice that n^2 < (n+1)*n < (n+1)^2 - the square root of 2160 is 46.4758..., so n=46. We can check that: 46*47=2162.
  • How do you get the amount in dollars and cents if you save pennies? Or did you mean to say

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