Let's use x to represent the number of hours since we don't know that.
750+250x<u><</u><u />2500
Subtract 750 from both sides.
250x<u><</u><u />1750
Divide both sides by 250.
x<u><</u><u />7
The most hours that they can do is 7, or it can be less.
Well, first you need to know how many pints go into a quart then with the left over pints that don't make a quart go into the other box. Now I don't have the conversions on hand but you could probably look it up.
Answer: 5 lunches for $71 is better
57/4=14.25
71/5=14.2
For this case we must compare the following expressions:

We convert the mixed number to a fraction:

So, we have to compare:
1.2 and 1.2
It is observed that the expressions are equal, so we have the sign of equality "=":

Answer:

B 140
Cause the mean affected by addition equations