Olivia spent 3 hr 20 min studying for her history test.
What percent of 500 minute did she study for her history test.

40%

Step-by-step explanation:

The first step is to convert 3 hours and 20 minutes to minutes. Since there are 60 minutes in an hour, multiply 60 by 3 to get 180. Then, add to the 20 leftover minutes to get 200. The ratio so far is 200:500. To make this simpler, rewrite the ratio as 20:50. Next, multiply each number by 2 to get a percentage out of 100. We get 40:100, or 40 out of 100. This means that the percentage is 40%.

correct answers below:

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24