<p>Of 220 stamps in a certain stamp collection, exactly 60 were U.S. Stamps and 110 were canceled. If 60 percent of the U.S. stamps were canceled, how many of the stamps were both not U.S. stamps and not canceled? </p>
<p>ans 86</p>
<p>I just did mental math here. 60% of 60 is 36, which means that 74 non-US stamps were cancelled, along with the cancelled US stamps. Subtract the amount of stamps already cancelled from 220 (110), then subtract 24 (the number of active US stamps) from that and you get 86.</p>
<p>I am guessing this is a write-in problem, if this is an SAT question.</p>
<p>EDIT: Oh, looks like you may have already solved it before my response, didn’t see your edit.</p>
<p>one cup of vinegar and 1 cup of oil are added to 2 cups of original vinegar and oil salad dressing . if the yield is 4 cups of dressing that is 1/3 vinegar by volume , what fraction of the original dressing was vinegar ?</p>
<p>1/6</p>
<p>4/3 cup vinegar and 8/3 cup oil</p>
<p>Subtract 1 cup from each:</p>
<p>1/3 cup vinegar and 5/3 cup oil</p>
<p>So originally, the vinegar : oil ratio was 1:5, so the fraction of vinegar is 1/6.</p>