Hi I am a mother of 13 yr kid he is in year 9 and my maths isn’t very good, I am meant to help him on his maths revision, could some one please help me how 2 work out a few questions. Thank you!
1) there are some cubes in a bag. The cubes are either red (R) or black (B)
the teacher says: if you take a cube at random out of the bag, the probability that it will be black is 1/5
a) what is the probability that the cube will be black ?
b)a pupil takes one cube out of the bag. It is red
What is the smallest number of black cubes there could be in the bag ?
c)Then the pupil takes another cube out of the bag. It is also red.
From this new information, what is the smallest number of black cubes there could be in the bag ?
d)A different bag has blue, Green and yellow cubes in it. There is at least one of each of the three colours.
The teacher says: if you take a cube at random out of the bag, the probability that it will be green is 3/5.
There are 20 cubes in the bag.
What is the greatest number of YELLOW cubes there could be in the bag? show your workings properly
Please help on year 9 work?
1) probobility it will be black: 1/5 as you said and probobility it will be red is 4/5
thats the 1st one but cant do the rest sorry lol
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