a brother sister and mother have picked apples. the sister picked 10 more apples than the brother and her mother picked 12 apple
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For a square: 
Solve for the length of a side by taking the square root of both sides:
Now we can substitute known values:
Solve for the length of a side by taking the square root of both sides:
Now we can substitute known values:
Since you want to find out how many papers Mr. Elliot grades per minute, and he grades 50 every 20 minutes, divide 20 by 20, and you get 1 minute, and now divide 50 by 20, and you get 2.5 papers per minute. Mr. Elliot grades 2.5 papers per minute.