John sells tickets to a school concert. adult tickets cost $6.50 and children's tickets cost $4.50. john collects a total of 157.50 from the ticket sales and he sells twice as many adult tickets as children's tickets. how many tickets does he sell all together?

The total number of tickets that John sold is 27

Step-by-step explanation:

Let x represent the number of adult tickets that John sold at the concert.

Let y represent the number of children's tickets that John sold at the concert.

Adult tickets cost $6.50 and children's tickets cost $4.50. John collects a total of 157.50 from the ticket sales it means that

6.5x + 4.5y = 157.5 - - - - - - - - - -1

John sells twice as many adult tickets as children's tickets. This means that

x = 2y

Substituting x = 2y into equation 1, it becomes

6.5 × 2y + 4.5y = 157.5

13y + 4.5x = 157.5

17.5y = 157.5

y = 157.5/17.5 = 9

x = 2×9 = 18

The total number of tickets that John sold is 9 + 18 = 27

they can both be solutions depends on the equation

step-by-step explanation:

what is the equation? ?

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m