Seek a very simple mathematical probability problem! English slightly better into! In the casino game called high-low, there are three possible bets.Assume that $1 is the size of the bet .A pair of fair 6-sided dice is rolled and their sum is calculated.If you bet Low ,you win $1 if the sum of the dice is {2,3,4,5,6}.if you bet high ,you win $1 if the sum of the dice is {8,9,10,11,12} if you bet on {7} you win $4 if a sum of 7 is rolled.Otherwise you lose on each of the three bets.In all three cases,your origional dollar is returned to you if you win.Find the expected value of the game to the better of the bet of high.

Seek a very simple mathematical probability problem! English slightly better into! In the casino game called high-low, there are three possible bets.Assume that $1 is the size of the bet .A pair of fair 6-sided dice is rolled and their sum is calculated.If you bet Low ,you win $1 if the sum of the dice is {2,3,4,5,6}.if you bet high ,you win $1 if the sum of the dice is {8,9,10,11,12} if you bet on {7} you win $4 if a sum of 7 is rolled.Otherwise you lose on each of the three bets.In all three cases,your origional dollar is returned to you if you win.Find the expected value of the game to the better of the bet of high.

If you bet low, you win $1 if the sum of the dice is (2,3,4,5,6). If you bet high, you win $1 if the sum of the dice is (8,9,10

There are 80 balls marked No. 1, No. 2, No. 3, No. 79, No. 80 respectively. Put them in a jar (we name the 40 balls 1-40 as trumpets and the 40 balls 41-80 as tubs) and touch out 20 balls by hand
It is known that the probability of finding out that the trumpet is more than the trumpet is the same as that of finding out that the trumpet is more than the trumpet
Q1: what's the probability of finding out the same number? What's the probability of finding out the same number
Q2
After touching 20 balls, put them in again and touch 20 balls again. What's the probability of touching the same amount three times in a row? What's the probability of touching the same amount? What's the probability of touching the same amount three times
Because it's heavy for me

① The same probability is C (40,10) C (40,10) / C (80,20) = 20.32%
The probability of large size more than small and small size more than large is (1-20.32%) / 2 = 39.84%
② Three times at least one out of the same number of probability is
1-(1-20.32%)^3==49.41%

The wage ratio of Xiao Zhou, Xiao Li and Xiao Fang is 3:1:5, and Xiao Li's wage is 300 yuan. What are the wages of Xiao Zhou and Xiao Fang?
Thank you so many friends downstairs for your answers,
225,375
I can't understand it

Xiao Li's salary is 300, then:
3:1:5=
Xiao Zhou: Xiao Li: Xiao Fang=
3 * Xiao Li's salary: 1 * Xiao Li: 5 * Xiao Li
=900：300：1500
The answer is also wrong. Or Xiao Li's salary is 75

Please give a detailed answer to the simple math calculation in grade 4 of primary school, thank you! (1421:8:40)
76*69+76
 
26*14-26*9-26

76*69+76
=76*69+76*1
=76*（69+1）
=5320
26*14-26*9-26
=26（14-9-1）
=26*4
=104