2/6/2016 08:20:16 am
Great exercise. Thanks Paul !
Reply
2/6/2016 08:47:15 am
15 boys. Used a probability tree with b for boys and g for girls, formed an equation then solved. Lovely question for GCSE higher pupils to test knowledge of probability and algebra simultaneously. Reminds me of the controversial 'sweet' question from last year's GCSE.
Reply
2/6/2016 09:39:34 am
Agree with Paul. The puzzle has similarities to the infamous Hannah's sweets question. .
Reply
Ahmad
3/6/2016 01:19:20 am
let n is the number of all students, so,
Reply
Paul
3/6/2016 07:48:08 am
As always, loving your comments, guys. Do keep them coming.
Reply
tom
5/6/2016 06:48:00 pm
If n is the number of boys, 10C2/(10+n)C2 = 0.15; so (10+n)C2 is 10C2/0.15 = 45/1.5 = 300 = 25C2 so n+10 is 25.
Reply
raluca
5/7/2016 10:12:05 am
NO.will ahve in total only 40
Reply
## Leave a Reply. |
## Puzzle Ideas
If you have an idea for puzzle of the month, then please do let me know. ## Archives
April 2017
Don't forget to check out 'Teach Further Maths' - PowerPoints for Teachers and Students of A-Level Further Maths ...and the brilliant NEW educational card game 'Maths Trumps' |