Keisha is working on a math worksheet with 50 problems. she has completed 20 problems in 25 minutes. if she continues at the same pace, what will the total time be for her to complete the worksheet?
a) 31.25 minutes
b) 62.5 minutes
c) 70 minutes
d) 75 minutes

Work out the time it would take her to complete one problem (time taken ÷ problems done) and then multiply that answer by the total number of problems to work out the total time.

So that would be:
25 minutes ÷ 20 problems = 1.25 problems per minute
1.25 problems per minute × 50 problems total = 62.5 minutes total.

The answer is: B) 62.5 minutes.