help?
Seats in an auditorium are numbered 1-500, and the principal is handing out snacks in an assembly. Every student whose seat is a multiple of 4 gets chocolate. Every student in a seat that is a multiple of 7 gets jelly beans, and every student in a seat that is a multiple of 10 gets chips.

The student in which seat number is the first to get all 3 treats?
-40
-70
-100
-140
what should i do to get the answer?

Question

help?
Seats in an auditorium are numbered 1-500, and the principal is handing out snacks in an assembly. Every student whose seat is a multiple of 4 gets chocolate. Every student in a seat that is a multiple of 7 gets jelly beans, and every student in a seat that is a multiple of 10 gets chips. 

The student in which seat number is the first to get all 3 treats? 
-40
-70
-100
-140
what should i do to get the answer?

directrix · Answer

I think we want the LCM (least common multiple) of 4, 7, and 10.

directrix · Answer

LCM
The smallest positive integer into which two or more integers divide evenly. For example, 24 is the LCM of 8 and 12. Sometimes the LCM is written using brackets: [8, 12] = 24.

directrix · Answer

What is the smallest positive integer into which 4, 7, and 10 will divide?

directrix · Answer

4 = 2*2
7 = 7*1
10 = 2*5

To get the LCM, you need the product of 2, 2, 7, and 5.

What is that number?  @alynck

anonymous · Answer

140?

directrix · Answer

@alynck  That's what I got.