MathDB

1

Part of 2011 AMC 10

Problems(2)

Price of Cell Phone Plan

Source: AMC 10 2011 a Problem 1

6/25/2011
A cell phone plan costs $20\$20 each month, plus 55¢ per text message sent, plus 10¢ for each minute used over 3030 hours. In January Michelle sent 100100 text messages and talked for 30.530.5 hours. How much did she have to pay?
<spanclass=′latex−bold′>(A)</span>$24.00<spanclass=′latex−bold′>(B)</span>$24.50<spanclass=′latex−bold′>(C)</span>$25.50<spanclass=′latex−bold′>(D)</span>$28.00<spanclass=′latex−bold′>(E)</span>$30.00 <span class='latex-bold'>(A)</span>\$ 24.00\qquad<span class='latex-bold'>(B)</span>\$ 24.50\qquad<span class='latex-bold'>(C)</span>\$25.50\qquad<span class='latex-bold'>(D)</span>\$28.00\qquad<span class='latex-bold'>(E)</span>\$30.00
AMC
Difference of two fractions

Source: AMC 10 2011 b Problem 1

2/24/2011
What is 2+4+61+3+5−1+3+52+4+6?\frac{2+4+6}{1+3+5} - \frac{1+3+5}{2+4+6}? <spanclass=′latex−bold′>(A)</span> −1<spanclass=′latex−bold′>(B)</span> 536<spanclass=′latex−bold′>(C)</span> 712<spanclass=′latex−bold′>(D)</span> 14760<spanclass=′latex−bold′>(E)</span> 433 <span class='latex-bold'>(A)</span>\ -1 \qquad <span class='latex-bold'>(B)</span>\ \frac{5}{36} \qquad <span class='latex-bold'>(C)</span>\ \frac{7}{12} \qquad <span class='latex-bold'>(D)</span>\ \frac{147}{60} \qquad <span class='latex-bold'>(E)</span>\ \frac{43}{3}
AMC