Henry made 30 cookies for the bake sale. He ate 1/3 of them as they came out of the oven. He then had to bake 20 more cookies. At the sale, he sold 1/2 of them. How many cookies are left?

20 cookies left

Step-by-step explanation:

Henry had 30 cookies but ate 1/3 of them as they came out.

He now has (30 * 1/3 = 30/3 = 10) 30-10 = 20 cookies left

He makes 20 more cookies.

He now has 20 + 20 = 40 cookies.

He sold half of them. He now has (40* 1/2 = 40/2 = 20) 40 - 20 = 20 cookies left.

65°

step-by-step explanation:

the total measure of a triangle is 180 degrees. 62 + 53 is 115.

180 - 115 = 65

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