SOLUTION: A math 109 student must solve 270 problems for her college of the air class. If she solves 15 problems in 40 minutes then at this rate, how many hours will it take her to complete

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Question 133752: A math 109 student must solve 270 problems for her college of the air class. If she solves 15 problems in 40 minutes then at this rate, how many hours will it take her to complete all 270 problems?
Found 2 solutions by SoOoDumb, Earlsdon:
Answer by SoOoDumb(14) About Me  (Show Source):
You can put this solution on YOUR website!
15%2F40+=+270%2Fx
x = number of minutes
Cross multiply
15x=40*270
15x=10800
Divide both sides by 15
x=720
720/60=12
It will take them 12 hours to finnish all 270 problems

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
You can use proportions to solve this problem:
40%2F15+=+x%2F270 In words... 40 mins to solve 15 problems is to x mins. to solve 270 problems. Simplify and solve for x.
x+=+40%2A%28270%29%2F15 Do the math.
x+=+10800%2F15
x+=+720minutes. Divide by 60 to find the number of hours.
x+=+12hours to complete 270 problems.