MathDB
Problems
Contests
National and Regional Contests
USA Contests
MAA AMC
AMC 8
2010 AMC 8
9
9
Part of
2010 AMC 8
Problems
(1)
2010 AMC 8 #9
Source:
5/21/2011
Ryan got
80
%
80\%
80%
of the problems on a
25
25
25
-problem test,
90
%
90\%
90%
on a
40
40
40
-problem test, and
70
%
70\%
70%
on a
10
10
10
-problem test. What percent of all problems did Ryan answer correctly?
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64
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B
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75
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C
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80
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D
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84
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E
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86
<span class='latex-bold'>(A)</span>\ 64 \qquad<span class='latex-bold'>(B)</span>\ 75\qquad<span class='latex-bold'>(C)</span>\ 80\qquad<span class='latex-bold'>(D)</span>\ 84\qquad<span class='latex-bold'>(E)</span>\ 86
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(
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64
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(
B
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<
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75
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(
C
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<
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80
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(
D
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84
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(
E
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86
percent