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A department of motor vehicles asks visitors to draw numbered tickets

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A department of motor vehicles asks visitors to draw numbered tickets  [#permalink]

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New post 28 May 2018, 10:42
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A
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Question Stats:

57% (02:31) correct 43% (03:01) wrong based on 147 sessions

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A department of motor vehicles asks visitors to draw numbered tickets from a dispenser so that they can be served in order by number. Six friends have graduated from truck-driving school and go to the department to get commercial driving licenses. They draw tickets and find that their numbers are a set of evenly spaced integers with a range of 10. Which of the following could NOT be the sum of their numbers?

A) 1,254
B) 1,428
C) 3,972
D) 4,316
E) 8,010

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Re: A department of motor vehicles asks visitors to draw numbered tickets  [#permalink]

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New post 28 May 2018, 12:14
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CAMANISHPARMAR wrote:
A department of motor vehicles asks visitors to draw numbered tickets from a dispenser so that they can be served in order by number. Six friends have graduated from truck-driving school and go to the department to get commercial driving licenses. They draw tickets and find that their numbers are a set of evenly spaced integers with a range of 10. Which of the following could NOT be the sum of their numbers?

A) 1,254
B) 1,428
C) 3,972
D) 4,316
E) 8,010


Ans: D

Given 6 numbers that too evenly spaced with Range 10 so
lets say least is x and bcz range is 10 so largest is x+10. This way we know these number will be
x, x+2, x+4, x+6, x+8 and x+10
Sum of all = 6x+30 or 6(x+5)
; the sum of these 6 number is multiple of 6. so from the given sum any sum which is not divisible by 6, can not be the sum of the those six numbers.

Ans: D
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Re: A department of motor vehicles asks visitors to draw numbered tickets  [#permalink]

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New post 28 May 2018, 12:17
CAMANISHPARMAR wrote:
A department of motor vehicles asks visitors to draw numbered tickets from a dispenser so that they can be served in order by number. Six friends have graduated from truck-driving school and go to the department to get commercial driving licenses. They draw tickets and find that their numbers are a set of evenly spaced integers with a range of 10. Which of the following could NOT be the sum of their numbers?

A) 1,254
B) 1,428
C) 3,972
D) 4,316
E) 8,010



Given the range is 10

so let's assume that smallest number is x , therefore the greatest number will be x+10

also the number are evenly spaced and we need four numbers in between x and x+10, therefore x ,x+2,x+4,x+6,x+8,x+10

x+x+2+x+4+x+6+x+8+x+10 = 6x + 30 = sum of the all six numbers

Now working with each of the given option, we will find each of the number will satisfy the above equation except D
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Re: A department of motor vehicles asks visitors to draw numbered tickets  [#permalink]

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New post 17 Dec 2018, 19:57
Hey there,

Is there anything wrong with using S=An? According to this formula, we know that sum will always have to be divisible by 6, so look to see which number isn't divisible by 3 (since they're all even?).

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Re: A department of motor vehicles asks visitors to draw numbered tickets  [#permalink]

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New post 17 Dec 2018, 23:34
kilgo16 wrote:
Hey there,

Is there anything wrong with using S=An? According to this formula, we know that sum will always have to be divisible by 6, so look to see which number isn't divisible by 3 (since they're all even?).

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There is nothing wrong with using this formula.

Sum = Average * Number of terms

But note that you must first figure out that the average will be an integer so sum will be divisible by the number of terms i.e. 6.

Since there will be 6 numbers with a range of 10, the numbers will be like 1, 3, 5, 7, 9, 11 - i.e. alternate numbers. So average will be the number in the middle of 3rd and 4th numbers which will be an integer. Hence the sum will be divisible by 6.
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Re: A department of motor vehicles asks visitors to draw numbered tickets   [#permalink] 17 Dec 2018, 23:34
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