The impossible question?

Xephone_xenon SG · 2007-09-11T14:41:36+00:00

Tomorrow then i have maths. So wait. Sian, tomorrow dont feel like going to sch. English+Chinese+CombineHumans teacher on leave. Today i at class study two...

Xephone_xenon SG

Okay i got a bloody impossible question right here.
I dunnoe if there is a answer for it, but its printed as question 3b on my maths paper 1.

Q) Find the smallest number if divided by 7,9 and 15 which leaves a remainder of 3.

So in algebra is

7a+3=x
9b+3=x
15c+3=x???

I tried to solve with simultaneous equation also cannot.
Like impossible to do, no such number.

--------------------------------------------------------------

One more. I think this one is do-able. But i cant see the pattern to it.

Q) Write down the next two terms.

7/8,2/3,1/2,4/11,1/4, ___ ___.

I simplified the whole thing liao.

Its 231/264,198/264,132,264,96/164,66/264.
In decimals 0.875,0.75,0.5,0.36363636363~,0.25.
Can see a definate pattern?

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First one i think dont try too hard on it.
I think impossible one.

And may i know what secondary school is BVSS? Question so funny one.

oOprinceOo SG

u doing revision paper frm another sku [ bvss]?

Xephone_xenon SG

Yep. 2002 de mock paper 1.

eagle SG

So mah fan for what

Find LCM of 7, 9 and 15, then add 3 lor

Answer: 318?

eagle SG

eh

are the answers

0, 1/14 ?

eagle SG

I will be back to check at around 12 midnight plus

Got to go off

Xephone_xenon SG

Oh god, i am noob, nvr think of it.

Xephone_xenon SG

I dont have answer sheet leh Confused

Anyway thanks!

unclebutcher SG

you can use rref

unclebutcher SG

haha when i saw this thread i immediately thought it was some kind of philosophical question =.=

akinos SG

they are from secondary school leiz, not JC leiz. trying to show off ur GC skills is it.. =P

gigabyte14 SG

i have no idea how this will affect jobs in the future

seriously the education system in sg is too pressuring Confused

unclebutcher SG

i talk c0ck only lahhhh

eagle SG

hmm, I think I'm wrong anyway

akinos SG

TS, before i go any further to try to solve ur 2nd problem… is there any typo in the question? because ur simplified part there are errors in the fraction and decimal. so pls clarify ASAP.

tanjun SG

Originally posted by Xephone_xenon:
Okay i got a bloody impossible question right here.
I dunnoe if there is a answer for it, but its printed as question 3b on my maths paper 1.

Q) Find the smallest number if divided by 7,9 and 15 which leaves a remainder of 3.

So in algebra is

7a+3=x
9b+3=x
15c+3=x???

I tried to solve with simultaneous equation also cannot.
Like impossible to do, no such number.

--------------------------------------------------------------

One more. I think this one is do-able. But i cant see the pattern to it.

Q) Write down the next two terms.

7/8,2/3,1/2,4/11,1/4, ___ ___.

I simplified the whole thing liao.

Its 231/264,198/264,132,264,96/164,66/264.
In decimals 0.875,0.75,0.5,0.36363636363~,0.25.
Can see a definate pattern?

----------------------------------------------------------------

First one i think dont try too hard on it.
I think impossible one.

And may i know what secondary school is BVSS? Question so funny one.

For the first qn,
By right, 3 is the smallest number.
0 x 7 + 3 = 3
0 x 9 + 3 = 3
0 x 15 + 3 = 3

If not, 15 x 3 x 7 + 3 = 318 Mr. Green

tanjun SG

For the second qn, I can think of the next term only which is 41/264.

7/8, 2/3, 1/2, 4/11, 1/4, ____ _____

Convert them to LCD.
231/264, 176/264, 132/264, 96/264, 66/264.

I see it as a number pattern.
231, 176, 132, 96, 66
Breaking it down further by their differences.
55, 44, 36, 30
Breaking it down further again by their differences.
11, 8, 6

Notice that the difference from 11 to 8 is 3 and from 8 to 6 is 2.
Thus, the next number is 5.
55, 44, 36, 30, 25

This implies that 231, 176, 132, 96, 66, 41.

Mr. Green Answer sure looks wierd.

Xephone_xenon SG

Question correct.
Anyway solve liao!
Thanks!

Xephone_xenon SG

But then, there are next two terms.
If the next term = 25
Then next next term? Stay the same?
Because cannot minus liao what.

tanjun SG

Can i know the 2 answers for the next 2 terms?