I can grade 5 papers in 45 minutes how many papers can I grade in 1.5 hours

Let N=number of papers graded in 1.5 hours (90 minutes).

Use ratio (assuming the grading rate is constant)

5 papers: 45 minutes = N papers : 90 minutes.
Cross multiply: N=(5/45)*90=10 papers.

To find out how many papers you can grade in 1.5 hours, you need to determine the number of papers you can grade in 1 hour and then multiply it by 1.5.

First, calculate the number of papers you can grade in 1 hour. Since you can grade 5 papers in 45 minutes, you can approximate that to 6 papers in 1 hour (since 60 minutes is 1 hour).

Next, multiply the number of papers you can grade in 1 hour by 1.5 to find out how many papers you can grade in 1.5 hours.

6 papers/hour * 1.5 hours = 9 papers

Therefore, you can grade approximately 9 papers in 1.5 hours.