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Hi all, This problem could be easy for some of you, but it was very tricky for me: If x is an integer, is 15 a factor of x? 1) 15 is a factor of 10x. 2) 15 is a factor of 11x. I appreciate your help. Hello Carloselopez , I'll just add my two cents. If this problem struck you as difficult, then this...
- by Carloselopez
Thu Sep 12, 2013 5:33 am- Forum: Data Sufficiency
- Topic: Number properties
- Replies: 7
- Views: 2227
Hi Carloselopez, I'll rephrase my explanation: Rule: if a number want to have a factor of 15, it should have both 3 and 5 factors. 10x = 1*2*5*x --> But for 10x to have the factor 15 it should have the 3 too, which is in x, so we just know that x has the factor 3 Does x has the factor 5? We don't k...
- by Carloselopez
Thu Sep 12, 2013 5:27 am- Forum: Data Sufficiency
- Topic: Number properties
- Replies: 7
- Views: 2227
IMO B is the answer. 1) 15 is a factor of 10x ==> 10x have 3 and 5 factors ==> x should have the 3 because 10 just have the 2 and 5 factors. ==> answer could be B C E. 2) 15 is a factor of 11x. ==> 11x have 3 and 5 factors ==> x should have both 3 and 5 factors because 11 just have the factor 11. =...
- by Carloselopez
Mon Sep 09, 2013 10:10 am- Forum: Data Sufficiency
- Topic: Number properties
- Replies: 7
- Views: 2227
Proportions and sets
The average height of a group of 5 people is 70 inches. What is the height of the shortest person in the group? 1) If the shortest person left the group, the average height of the group would be 72,5 inches. 2) The ratio of height of the tallest person in the group to the height of the shortest pers...
- by Carloselopez
Sun Sep 08, 2013 5:52 pm- Forum: Data Sufficiency
- Topic: Proportions and sets
- Replies: 5
- Views: 1806
Number properties
Hi all,
This problem could be easy for some of you, but it was very tricky for me:
If x is an integer, is 15 a factor of x?
1) 15 is a factor of 10x.
2) 15 is a factor of 11x.
I appreciate your help.
- by Carloselopez
Sun Sep 08, 2013 5:10 pm- Forum: Data Sufficiency
- Topic: Number properties
- Replies: 7
- Views: 2227