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Consider dates represented by three numbers in the form day-month-year
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22 Jul 2025, 00:53
22 Jul 2025, 00:53
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Consider dates represented by three numbers in the form day-month-year. For example, 21-3-2000 represents March 21, 2000. A date in which the day, month, and year are each divisible by 5 is called a "triple-five date." How many triple-five dates were there in the year 2010?
a) 6
b) 9
c) 10
d) 11
e) 12
a) 6
b) 9
c) 10
d) 11
e) 12
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Re: Consider dates represented by three numbers in the form day-month-year
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23 Jul 2025, 17:53
23 Jul 2025, 17:53
1
As stated: A date in which the day, month, and year are each divisible by 5 is called a "triple-five date and we are asked for the year 2010:
We know that 2010 is divisible by '5'. So we first need "month(s)" divisible by '5' (from 1 to 12) and those are '5' and '10'.
Month 5 is May and all dates divisible by 5 will be multiples of 5:5,10,15,20,25,30 (Total 6)
Similarly, month 10 is October and all dates divisible by 5 will be multiples of 5:5,10,15,20,25,30 (Total 6)
So total triple five dates will be 6 + 6 = 12
Answer E
We know that 2010 is divisible by '5'. So we first need "month(s)" divisible by '5' (from 1 to 12) and those are '5' and '10'.
Month 5 is May and all dates divisible by 5 will be multiples of 5:5,10,15,20,25,30 (Total 6)
Similarly, month 10 is October and all dates divisible by 5 will be multiples of 5:5,10,15,20,25,30 (Total 6)
So total triple five dates will be 6 + 6 = 12
Answer E
gmatclubot
Re: Consider dates represented by three numbers in the form day-month-year [#permalink]
23 Jul 2025, 17:53
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