Maria has already written 2/5 of her 1,000 word essay. The same pace of 6 1/2 words is a per minute. Which expression shows the amount of time it wil take her to write the rest of the essay?

Question

Here are the choices:

A. 1000 x 2/5 x 13/2

B. 1000 x 2/5 divide by 13/2

C. 1000 x 3/5 x 13/2

D. 1000 x 3/5 divide by 13/2

Answer 1

If she has completed 2/5 she has 3/5 more to go. Her speed is 13/2 words per minute. So 1000*3/5 (600 words) at 13/2 words per minute means we need to divide the number of words by the speed to work out the time: 1000*3/5/(13/2), which is answer D. [To work this out we divide 600 by 13/2 which means (you've guessed it!) 600*2/13=1200/13=92 4/13 minutes. 4/13 of a minute is 4/13 of 60 seconds=240/13=18.5 seconds approx.]

Answer 2

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