please help, it's for a math class. i have more whre this one came from. :)
2007-07-11 18:21:58 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The answer is 23.
First, let's show 23 is not possible.
23 is not divisible by 7 or by 5.
Subtract 5 to get 18 - which is not divisible by 7.
Subtract 5 more to get 13 - which is not divisible by 7.
Subtract 5 more to get 8 - which is not divisible by 7.
Subtract 5 more to get 3, which is less than 5 or 7.
Hence, it's impossible to score a 23.
Next, let's show that all numbers above 23 are possible.
24 = 2*7 + 2*5
25 = 5*5
26 = 3*7 + 5
27 = 7 + 4*5
28 = 4*7
Any number higher than 28 must therefore also be possible, since such numbers must be some multiple of 5, added to one of the numbers 24-28.
Hope that helps!
2007-07-11 19:24:14 · answer #1 · answered by Bramblyspam 7 · 1⤊ 0⤋
23
2007-07-11 18:30:13 · answer #2 · answered by brother Mohammed 2 · 0⤊ 0⤋
Using a standard dartboard in which you are restricted to the regions 5 and 7, the highest possible score is triple 7.
If you get 3 darts in a single turn then 3(3x7) = 3x21 = 63
2007-07-11 18:34:28 · answer #3 · answered by Aevin 3 · 0⤊ 1⤋
23
.
2007-07-11 18:26:24 · answer #4 · answered by tsr21 6 · 1⤊ 0⤋
I'm really confused.
2007-07-11 18:26:41 · answer #5 · answered by Anonymous · 0⤊ 1⤋