arivalen
18.11.2020 •
Mathematics
The school that Adam goes to is selling tickets to a choral performance. On the first day of ticket sales the school sold 5 senior citizen tickets and 15 student tickets for a total of $137.50. The school took in $430 on the second day by selling 20 senior citizen tickets and 44 student tickets. Find the price of a student ticket.
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Ответ:
Let the price of one senior citizen ticket be sc and the price of one student ticket be st.
Let's write equations using the information given and the variables above:
=> 5sc + 15st = $137.50
=> 20sc + 44st = $430
Hmm.. We can multiply 5sc by 4 to get 20sc.
=> 4(5sc) + 4(15st) = 4($137.50)
=> 20sc + 60st = $550
Now we can subtract the second equation from the first to determine the price of a student ticket.
20sc + 60st = $550
- 20sc + 44st = $430
=> 16st = $120
=> st = $7.5
So, the price of a student ticket is $7.5.
Ответ:
answer: the probability is: 1/4
step-by-step explanation: the coin is fair, the probabilities of getting a head and a tail are equal to 1/2.the probability of getting an even number on a die is 3/6 =1/2 because among 6 results there are 3 even numbers.finally to calculate the probability of event a\cap b we have to multiply the calculated p(a/capb)+1/2.1/2=1/4