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➷ Find the total number of marbles (this will be the denominator):
4 + 16 + 5 + 16 + 10 = 51
Probability of pulling out red marble:
4/51
Probability of pulling out a green marble:
10/51
Add these two probabilities together:
14/51 <== the answer
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Answer:
3 equals 49 cents 5 equals 81 cents
Hi,
I think this is the table, correct?
Number of Tubes 3 5 7
Cost ($) 12 20 28
we can calculate the prize as the number of tubes multiplied by 4:
3*4=12
5*4=20
7*4=28
which means that one tube costs 4 dollars!
However, in the store A two tubes cost 7, which means that one costs half of this -3.5
So Store B is more expensive (4 dollars per 4 rather than 3.5 as in Store A).