Answer:
Good luck with math this year. Study hard for tests
Step-by-step explanation:
See the image.
Let
be the price of an adult ticket, and
the price of a child ticket.
The sentence "Three adults and four children must pay $122 for tickets" translates to 
The sentence "Two adults and three children must pay $87" translates to 
Which leads to the linear system

You can solve this system as you prefer, for example you can multiply the first equation by 2 and the second by 3 to get

Now subtract the first from the second:

Now plug this value for c in any of the equations, for example the first:

20 cartons of ice cream = 1 carton of ice cream = $4, meaning that $4 x 20 = $80
2 cartons of yogurt = 1 carton of yogurt = $1, meaning that $1 x 2 = $2
$80 + $2 = $82
Hope this helped!
Nate
Answer: There are 15 friends.
Step-by-step explanation:
We know that there is N friends (N is the number that we are looking for)
Each friend weights 1/20 ton.
Now, the weight of the N friends together is N times 1/20 ton.
Then we have:
N*(1/20) ton = 3/4 ton
We solve this for N.
First multiply both sides by 20.
20*N*(1/20) = N = 20*(3/4) = 60/4 = 15
Answer:
The answer is 12/11
Step-by-step explanation:
5x+25-25=12-6x
5x=12-6x
11x=12
x=12/11