Gina visited the aquarium with some of her cousins, aunts, and uncles. The group bought 20 admission tickets for $340. Adult tickets cost $20, and children’s tickets cost $15. How many adult tickets and how many children tickets did the group buy?

Write a system of equations. Then, solve the system algebraically.

Step-by-step explanation:

20 a+5c=340

a+c=20

c=20-a

20 a+5(20-a)=340

20a+100-5a=340

15a=240

a=16

a=20-16=4

16 adult tickets

4 children tickets.

180

step-by-step explanation:

12-2=10

20-2=18

18x10=180

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles