More fun puzzles. This time it is numbers.
By cloudwatcher
@cloudwatcher (6861)
Australia
January 18, 2007 3:29am CST
What is the next number in these number lines?
Explain your answer
A. 143 120 99 80 63 48 ??
B. 33 36 42 44 48 56 ??
C. 8 12 18 27 40.5 ???
D. 2 3 6 10 17 28 46 ??
E. Why is the number ten afraid of the number seven?
3 responses
@imadriscoll (2228)
• United States
18 Jan 07
E.... because 7 8 9! ... or because seven ate nine!
1 person likes this
@Darkwing (21583)
•
19 Jan 07
A. 35 (Because odd numbers descending are subtracted each time; 23, 21,, 19, 17, 15, so 48 - 13 is next)
B. 72 (Too difficult to explain, lol)
C. 60.75 (11/2 times added each time)
D. 75 (1+3=4 3+4=7 added 7+4=11 added etc. Answer made from 11+18=29. 29+46+75)
E. Because 7 8 9.
@Darkwing (21583)
•
21 Jan 07
Awwwwwww, thank you Cloud, but I feel a bit bad about this because........ according to your calculations, I got B wrong, with 72. Let me tell you how I worked it out... complicated, so bear with me. lol.
33+(3)=36, (3 x 2 = 6), 36 + (6) 42, 42 + (2) = 44, (2 x 2 = 4), 44 + 4 = 48, 48 + (8) = 56, (8 x 2 = 16), 56 + 16 = 72
Lol... told you it was complicated but 72 is right on that assumption. :-) Now, I feel worthy! lol
@cloudwatcher (6861)
• Australia
19 Jan 07
A It seems two of you have worked out A and come to the right conclusion, but worked it out differently. The way I worked it: 143=12x12-1. 120=11x11-1. 99=10x10-1. 80=9x9-1. 63=8x8-1. 48=7x7-1 therefore 6x6-1 = 35.
B Each succeeding number is obtained by adding the last digit of the preceding number. 33+3. 36+6. 42+2. 44+4. 48+8. 56+6 = 62.
On this one, two people came to the conclusion of 72 so I am wondering how you worked this one out.
C. One and a half times each number. Therefore the last number is 40.5 + 20.25 = 60.75
D. Once again I can't follow your reasoning, but you have the right answer. 2+1=3. 2+3+1=6. 6+10+1=17. 10+17+1=28. 17+28+1=46. 28+46+1 = 75.
Congratulations, Darkwing. You are the first to get them all right, so you get the best response.
