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https://vle.mathswatch.co.uk/images/questions/question1001.png

=30 people
1/4=7
2400-900=1500

2400-900=£1500
they should raise £1500

 

done this so far and got 1/3 marks plz hep

 May 1, 2020
 #1
avatar+23646 
+2

First part is pretty simple:

B.  3 out of 12 is a 7     9/12 is NOT a 7        9/12 (of 120 people) will lose    3/12 will win

        can you doit from this partial solution?

 

 

 May 1, 2020
 #2
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confused on b

Guest May 1, 2020
 #3
avatar+23646 
+1

9/12 of 120 = losers = 90 losers

3/12            = winners = 30 winners

 

revenue from 120 entries = 120 x 20 = 2400

                  30 winners x 30 = 900 paid out

2400-900 = net 'winnigs' = 1500                       (you had it correct) cheeky

 May 1, 2020

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