Math brain teaser

**Umm_Maysa** · 12-31-2005

Ahmad is writing a book. He starts on page 1. When he finished, he uses a total of 228 digits.How many pages does he have?

**Umm_Maysa** · 01-03-2006

Anyone has question related to this topic?? Don't have to wait only from me. We may share in here.Anyone????

**shudnt_have** · 01-03-2006

I will start off with an easy question; inshallah.
2x + 3y = 19 and 6x - 3y = 21. Find x and y.

**shudnt_have** · 01-03-2006

if this is too easy then here is one I have for ya..

Laila has 17 members in her family. Samira has 10 members. Laila’s 4 of the “members” are same as Samira’s. How many members would be in the annual reunion of both of these families?

**Umm_Maysa** · 01-03-2006

Originally Posted by shudnt_have

I will start off with an easy question; inshallah.
2x + 3y = 19 and 6x - 3y = 21. Find x and y.

2x + 3y = 19....(a)
6x - 3y = 21....(b)
(a)+(b) => 8x = 40
x= 5
then y =3

**Umm_Maysa** · 01-03-2006

Originally Posted by shudnt_have

if this is too easy then here is one I have for ya..

Laila has 17 members in her family. Samira has 10 members. Laila’s 4 of the “members” are same as Samira’s. How many members would be in the annual reunion of both of these families?

What do u mean by same? same age same numbers???

**shudnt_have** · 01-03-2006

Originally Posted by maysa

What do u mean by same? same age same numbers???

same numbers...
btw, mashallah the last one was correct:rose:

**shudnt_have** · 01-03-2006

Lol, Mashallah Correct..now its your turn.:sister:

**Umm_Maysa** · 01-04-2006

I will give it a try
Let's say a=b
then multiply both side with a
a*a=a*b
a²=ab

then subtract with b²
a²-b²=ab-b²

factor both side
(a+b)(a-b)=b(a-b)

cancel both same
a+b=b

since a=b then
b+b=b

so 1b' +1b"=1b''' ...the ' denote the position of the b
so 1b"=1b'''-1b'
1b=0b
1=0 proved#
so

**Mainul_Islam** · 01-05-2006

lol nice...

are u a mathematician or something??

**Umm_Maysa** · 01-05-2006

I don't do copy paste , but I know this problem..but Zak is real mathematician
I can't get a=b=1 which I think much quicker and shorter way...Anyway maths always my favourite subject but I am not mathematician...

**Umm_Maysa** · 01-05-2006

this not math I think..
Abdullah and his 7 friends (8 persons all together) went to the restaurant. He ordered the pizza. The owner of restaurant said if u can cut this pizza only by 3 cut for eight persons I will give another free pizza. Abdullah then cut the pizza and they receive another free pizza. How would he do it??
(eg: if u cut the pizza like the cross means u have made 2 cut-one horizontal one vertical)

**Mainul_Islam** · 01-05-2006

cut the pizza 120 degrees for each point from the center.

**sapphire** · 01-05-2006

^^yup thats what i was going to say.......otherwise i dont under stand the question......

**Umm_Maysa** · 01-05-2006

That's 3 cut right but it is only for 3 person while u are 8...

**sapphire** · 01-05-2006

making three cuts but we end up with eight slices is that the question??

**Umm_Maysa** · 01-05-2006

Originally Posted by sapphire

making three cuts but we end up with eight slices is that the question??

Yess definitely

Since nobody answered so I give the answer...Imagine a pizza..it is round right..then u make another round inside the pizza not to close to the edges(1 cut) and make a cross(means 2 cut).so u have 8 pieces...