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# maths help watch

1. i need help on this question
2. (Original post by Official-21)
Draw a Venn Diagram.
3. After drawing a venn digram work out the fractions and add them together
4. first get the total number of students, then just use a probability tree or table to find out what you want.
5. never mind i got 19/28 i figured it out just after posting sorry anyway thanks
6. (Original post by Official-21)
Do you need help?
7. yh
8. (Original post by Official-21)
yh
You know there are 20 outside the two sets so the total inside must be 100 - 20 = 80

Add the three expressions up and put equal to 80 and solve.
9. (Original post by Muttley79)
You know there are 20 outside the two sets so the total inside must be 100 - 20 = 80

Add the three expressions up and put equal to 80 and solve.
Addition to this, subtract 80 for both sides and factor the expression to solve for x. (Choose the positive value for x). Then it’s asking you to look at B interest T segment and the chance of getting a T will be
Spoiler:
Show
x/3x
substitute your value of x in 👍🏻
10. I get 27/55 as my answer simplified from 54/110
11. (Original post by Y11_Maths)
....
Just give a hint - that's the rules in the maths forum
12. (Original post by Official-21)
I get 27/55 as my answer simplified from 54/110

Draw a tree diagram ...
13. (Original post by Muttley79)
Just give a hint - that's the rules in the maths forum
My bad I get carried away I don’t know where to stop 😇
15. I put 19 on the second branch because the last sentence it says Another Marble is taken form the bag which made assume it is without replacement
16. (Original post by Official-21)
I put 19 on the second branch because the last sentence it says Another Marble is taken form the bag which made assume it is without replacement
It tells you that the marble was replaced before he took out the next marble so your fractions should still be out of 11
17. (Original post by Y11_Maths)
It tells you that the marble was replaced before he took out the next marble so your fractions should still be out of 11
Besides that your method is correct
18. does that not mean that it is without replacement as we dont know if she put it back or not

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