Number of red cards including 2 red queens = 26
Number of black queens = 2
Therefore, number of red cards including 2 red queens and 2 black queens = 26 + 2 = 28
Number of cards neither a red card nor a queen = 52 - 28 = 24
![P = \frac{ Number \: of \: favourable \: outcomes}{ Total \: numer \: of \: possible \: outcomes}](https://tex.z-dn.net/?f=P%20%20%3D%20%20%5Cfrac%7B%20Number%20%5C%3A%20of%20%5C%3A%20favourable%20%5C%3A%20outcomes%7D%7B%20Total%20%5C%3A%20numer%20%5C%3A%20of%20%5C%3A%20possible%20%5C%3A%20outcomes%7D%20)
Suppose the bigger time fills up the pool in x hours, the smaller pipe fills up the pool in 1.25x.
each hour the pipe finishes 1/x portion of the job, and the smaller pipe finishes 1/1.25x portion
in 5 hours, with both pipe working, the pool is full, that is 5/x + 5/1.25x =1
5/x +4/x=1
x=9
1.25*9=11.25=11 and a quarter=11 hours and 15 minutes
it will take the slower pipe 11 hours and 15 minutes to fill up the pool.
Answer:
A, D, F
Step-by-step explanation:
6(3b+4)=18b+24
6(3b+8)=18b+48
2(96-12)=192-24
3(6b+8)=18b+24
3(6b+4)=18b+12
2(9b+12)=18b+24