Difference between revisions of "2013 AMC 12A Problems/Problem 5"

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==Problem==
 
==Problem==
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Tom, Dorothy, and Sammy went on a vacation and agreed to split the costs evenly. During their trip Tom paid &#36;<math>105</math>, Dorothy paid &#36;<math>125</math>, and Sammy paid &#36;<math>175</math>. In order to share the costs equally, Tom gave Sammy <math>t</math> dollars, and Dorothy gave Sammy <math>d</math> dollars. What is <math>t-d</math>?
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<math> \textbf{(A)}\ 15\qquad\textbf{(B)}\ 20\qquad\textbf{(C)}\ 25\qquad\textbf{(D)}\ 30\qquad\textbf{(E)}\ 35 </math>
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==Solution==
 
Add up the amounts that Tom, Dorothy, and Sammy paid to get &#036;<math>405</math>, and divide by 3 to get &#036;<math>135</math>, the amount that each should have paid.
 
Add up the amounts that Tom, Dorothy, and Sammy paid to get &#036;<math>405</math>, and divide by 3 to get &#036;<math>135</math>, the amount that each should have paid.
  
==Solution==
 
 
Tom, having paid &#036;<math>105</math>, owes Sammy &#036;<math>30</math>, and Dorothy, having paid &#036;<math>125</math>, owes Sammy &#036;<math>10</math>.
 
Tom, having paid &#036;<math>105</math>, owes Sammy &#036;<math>30</math>, and Dorothy, having paid &#036;<math>125</math>, owes Sammy &#036;<math>10</math>.
  
 
Thus, <math>t - d = 30 - 10 = 20</math>, which is <math>\boxed{\textbf{(B)}}</math>
 
Thus, <math>t - d = 30 - 10 = 20</math>, which is <math>\boxed{\textbf{(B)}}</math>
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== See also ==
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{{AMC12 box|year=2013|ab=A|num-b=4|num-a=6}}

Revision as of 18:33, 22 February 2013

Problem

Tom, Dorothy, and Sammy went on a vacation and agreed to split the costs evenly. During their trip Tom paid $$105$, Dorothy paid $$125$, and Sammy paid $$175$. In order to share the costs equally, Tom gave Sammy $t$ dollars, and Dorothy gave Sammy $d$ dollars. What is $t-d$?

$\textbf{(A)}\ 15\qquad\textbf{(B)}\ 20\qquad\textbf{(C)}\ 25\qquad\textbf{(D)}\ 30\qquad\textbf{(E)}\ 35$

Solution

Add up the amounts that Tom, Dorothy, and Sammy paid to get $$405$, and divide by 3 to get $$135$, the amount that each should have paid.

Tom, having paid $$105$, owes Sammy $$30$, and Dorothy, having paid $$125$, owes Sammy $$10$.

Thus, $t - d = 30 - 10 = 20$, which is $\boxed{\textbf{(B)}}$

See also

2013 AMC 12A (ProblemsAnswer KeyResources)
Preceded by
Problem 4
Followed by
Problem 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
All AMC 12 Problems and Solutions