Math Questions

Test Preparation SAT Preparation
1

<p>The scale on a set of plans is 1:8. If a man reads a certain measurement on the plans as 5.6",
instead of 6.0", what will be the resulting approximate percentage error on the full-size model?</p>

<p>A) 6.7%
B) 7.1%
C) 12.5%
D) 53.6%
E) 56.8%
The answer is 6.7% but I would like to know whether there is any shorter way of solving the problem.</p>

<p>On a blueprint of park,1 foot represents half mile. If an error of half inch is made in reading the blueprint, what will be the corresponding error on the actual park?</p>

<p>A) 110 feet
B) 220 feet
C) 330 feet
D) 440 feet
E) None of these</p>

<p>The answer is “A”. Can someone please explain this to me.</p>

2

<p>First question is just .4/6.0 * 100 to find the percentage error.</p>

<p>Second one, 1 foot = half a mile = 5280/2 feet
So each inch represents 220 feet
Half an inch would be 110</p>

3

<p>thanks Jersey. But does it mean that scale always has no effect on percentage error?</p>