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a necklace

by ST » Fri Jun 19, 2009 10:28 am
a necklace is made by stringing N individual beads together in the repeating pattern red bread, green bead, white bead, blue bead, and yellow bead. if the necklace design begins with a red bead and ends with a white bead, then N could equal

a. 16
b. 32
c. 41
d. 54
e. 68


answer is E
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Re: a necklace

by dtweah » Fri Jun 19, 2009 10:59 am
ST wrote:a necklace is made by stringing N individual beads together in the repeating pattern red bread, green bead, white bead, blue bead, and yellow bead. if the necklace design begins with a red bead and ends with a white bead, then N could equal

a. 16
b. 32
c. 41
d. 54
e. 68


answer is E

N/5=q+3/5

N=5q+3
N= 5 x 13 + 3
N=68
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Junior | Next Rank: 30 Posts
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by vasbli » Fri Jun 19, 2009 11:13 am
if it ends with a white, you have lets say X full sequences of 5 beads and a portion made of 3 beads.

Basically you are looking for a number that is divisible by 5 with a remainder of 3

there is only 68 that fulfills such condition=>E
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by ST » Sat Jun 20, 2009 8:28 am
thank you
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