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# TSRian geeks! are u smarter than a British 13 year old? watch

1. (Original post by Student403)
Is this why you are named ChestBrahhh?

Lol that gif cracked me up, chestbrah is the brother of zyzz the famous bodybuilder that died at 22 think that is where his username is from or maybe from that gorilla.
2. (Original post by Puddles the Monkey)
How do you know this? Is that just a rule you have to know?
Sorry I made it sound a lot more complicated than it actually is!

It's just like saying "24 is divisible by 3". This is because there is no remainder when you divide
3. (Original post by Student403)
They are positive integers in the form of products of prime factors.
That isnt an integer then
4. (Original post by Student403)
Sorry I made it sound a lot more complicated than it actually is!

It's just like saying "24 is divisible by 3". This is because there is no remainder when you divide
Yes I realised I misread what you said

Would you just have to do all the math for that question by hand to work it out?
5. (Original post by Puddles the Monkey)
Yes I realised I misread what you said

Would you just have to do all the math for that question by hand to work it out?
Not at all You just break down 24 in to it's prime factors - to do this, think of the smallest number (excluding 1) you could divide 24 by. 2? That would leave 12. Keep going. 2 again? That would leave 6 - keep going. 2 again! That leaves 3 (which is the next smallest number you could divide 3 by). This means 3 is prime. So we can stop here. Look at the numbers I bolded now

2 * 2 * 2 * 3 = 24 - that is 24 in its prime factors

Now see which of the numbers in the answer options include the above as part of them. That should help you
6. (Original post by Student403)
Thanks to @Zacken the answers are
Spoiler:
Show
4086
10/11
36
D
11
1
6
336
36
1/13
According to these answers, I got 6/10 #SoSmart
7. (Original post by Student403)
Now see which of the numbers in the answer options include the above as part of them. That should help you
But they all have extra bits like 5s and 7s.... why can you just put whatever you want after and it's still divisible by 24?
8. Could someone please explain how to work out questions 5, 8, 9 and 10 to me?

For Q. 5 I got 7 as my answer because -

Bro Bro Bro Sis Sis Sis Sis

'Tegwen has the same number of brothers as she has sisters' - Cover up one 'Sis' and that statement is true.
'Each one of her brothers has 50% more sisters than brothers' - Cover up one 'Bro' and that statement is true, as 4 is 50% more than 2, right? Unless '50% more' means that the no. of sisters is 1.5x the number of brothers, which I now realise may be my error... Is this my mistake?
9. (Original post by Student403)
Thanks to @Zacken the answers are
Spoiler:
Show
4086
10/11
36
D
11
1
6
336
36
1/13
according 2 zackens answers i got 9/10 correct.
10. (Original post by HS2030)
according 2 zackens answers i got 9/10 correct.
Good job
11. (Original post by sandvika)
Did we get the same q6? I got How many of the above positive integers are divisible by 24? Did it mean products or was it a nonsense question?
Each line is a different number in the form of a product of its prime factors.
12. (Original post by Puddles the Monkey)
But they all have extra bits like 5s and 7s.... why can you just put whatever you want after and it's still divisible by 24?
is divisible by 8, isn't is? So is or whatever else you want to multiply 8 by.
13. (Original post by Student403)
Good job
Student403

did u do it and what did u get
14. (Original post by Puddles the Monkey)
But they all have extra bits like 5s and 7s.... why can you just put whatever you want after and it's still divisible by 24?
Remember it's only multiplied

For example 20 is divisible by 2.

We could write 20 as 2*2*5. If we multiplied 2*2*5 by 7 (i.e. 20*7=140), we'd get 2*2*5*7. This is still divisible by 2 because the important part is having 2 in the factor form.

It's just 7 lots of 20, but each 20 is still divisible by 2.
15. (Original post by Kaiylar)
According to these answers, I got 6/10 #SoSmart
Don't worry I only got 7/10 and I got a Gold in the SMC
16. (Original post by Student403)
Don't worry I only got 7/10 and I got a Gold in the SMC
17. (Original post by HS2030)
Student403

did u do it and what did u get
Did not do so well lol see above

18. (Original post by Student403)
Did not do so well lol see above
19. (Original post by Student403)
Remember it's only multiplied

For example 20 is divisible by 2.

We could write 20 as 2*2*5. If we multiplied 2*2*5 by 7 (i.e. 20*7=140), we'd get 2*2*5*7. This is still divisible by 2 because the important part is having 2 in the factor form.

It's just 7 lots of 20, but each 20 is still divisible by 2.
*lightbulb moment*

Thank you! I now understand.
20. (Original post by sandvika)
That isnt an integer then
The set of positive integers is closed under multiplication.

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