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Stuck on maths question

(32 Posts)
hercules1 Tue 25-Feb-14 22:28:44

Okay, got a question from the rules of maths book that I can't work out.

In a survey conducted in a junior school it was found that on one evening four times as many children watched BBC one as watched BBC2, and that twice as many children watched ITV as watch BBC one. If there were 310 children in the school, how many children watched each channel?

Any help gratefully received.

roguedad Wed 26-Feb-14 11:37:25

I meant iklboo and hercules1 - sorry iklboo. The problem is ill-posed - does not have a unique answer.

roguedad Wed 26-Feb-14 11:34:29

I think you are all, save hercules1, missing the point. The OP never said that all the children in the school were watching TV. So if the number of BBC2 viewers is n then all we know is that the total number of viewers is 13*n and this must be less than or equal to 310. So n is ANY whole number from 0 to 23 and the number of BBC1 and ITV viewers follows from that choice of n. n=10 works just as well as 23. If the OP has missed a bit out from the actual question then only then is it a different story.

hercules1 Tue 25-Feb-14 22:56:51

Sixth edition printed 1994. Dh bought in from Foyles in 2005 according to the price sticker.

iklboo Tue 25-Feb-14 22:54:05

It could be as few as 8 watched ITV, 4 watched BBC1 and 1 watched BBC2 - while the rest watched the other 8 million other channels (when was this book written with only 3 available channels??)

pippibluestocking Tue 25-Feb-14 22:53:56

Ah yes, that's it Edith, or maybe watching Dave!

MoreBeta Tue 25-Feb-14 22:53:06

For a moment there I thought 'Oooooh a nice simultaneous equation'

Feel a teeny bit deflated now. sad

Anyone else yearn for a random opportunity to flex their long defunct O Level maths muscles. grin

iklboo Tue 25-Feb-14 22:52:12

Some may not have been watching tv at all & it's a sneaky question. Or a misprint.

EdithWeston Tue 25-Feb-14 22:50:29

I suppose it could be pippi's answer, plus 11 children doing their maths homework...

Nocomet Tue 25-Feb-14 22:48:24

It doesn't work.

We agreed on Sunday you can't chop up children!

We don't have a people carrier so I said 2.5 DCs had to go in me and DHs cars. The assembled girls refused to oblige, 3&2 was their best offer grin

LineRunner Tue 25-Feb-14 22:48:17


pippibluestocking Tue 25-Feb-14 22:47:50

God you're right, ignore me!!

lisad123everybodydancenow Tue 25-Feb-14 22:47:19

Message withdrawn at poster's request.

LineRunner Tue 25-Feb-14 22:46:37

If 11 children were playing x-box, pippi would be very happy.

EdithWeston Tue 25-Feb-14 22:44:39

The trouble with that, pippibluestocking is that 310/13 = 23.85, so the pupils would need to be cut into pieces.

hercules1 Tue 25-Feb-14 22:44:35

We wondered whether it was something to do with not all the children watching TV but it doesn't tell you how many children didn't watch.

pippibluestocking Tue 25-Feb-14 22:44:32

Sorry, my mistake, it's 310 Divided by 13 = 23, so for ITV is 8x23, BBC1is 4x23 and so on

LineRunner Tue 25-Feb-14 22:44:04

Ah well, another ten minutes of my life I'll never get back because of school worksheet maths.

MoreBeta Tue 25-Feb-14 22:44:03

pippi - 310/13 =23.846

The BBC 2 viewers cant be 1/13th. Surely?

LineRunner Tue 25-Feb-14 22:42:42

Pippi, that doesn't add up to 310 though.

YarnyStasher Tue 25-Feb-14 22:42:41

But you can't have .84 of a child, Pippi.

pippibluestocking Tue 25-Feb-14 22:41:14

It's not a misprint. Add up all the proportions (8+4+1=13) and divide 310 by 13 and then multiply up by the proportions, so for itv, it's 13x8, for BBC1, it's 13x4 & for BBC2, it's 13x1

YarnyStasher Tue 25-Feb-14 22:41:13

Bbc1 = a
Bbc2 = b
Itv = c

a = 4b
c = 2a
c = 8b

a + b + c = 310
4b + b + 8b = 310
13b = 310

But that gives you a number for b that isn't a whole number, so either I'm wrong or the question is.

MoreBeta Tue 25-Feb-14 22:40:56

Yes I agree with all above its a misprint.

The number has to be divisible by 13.

hercules1 Tue 25-Feb-14 22:40:47

Dh and I have been trying for ages. Dd is long gone to bed! We got to the 13 parts bit and think there must be a mistake.

LineRunner Tue 25-Feb-14 22:40:10

Edith's right. It does not compute.

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