12/50=24% of student bring lunch so 24%-524=398 student buy lunch out of 524
10 quarts is the greatest about becuase it is equal to 40 cups.
Answer:
Given equation: 
when we complete the square , we take half of the value of 8 , then square it, and added to the left sides, we get;

∵8 is the value 
Notice that, we add this both sides so that it maintains the equality.
then;

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Simplify:

The number must be added to complete the square is, 
150% of 51 is 34. So your answer is 51
In the second fraction, factorize the denominator:

Then we have, as long as
,

which you could also write as
