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Mary and alice

Source: AMC 12 2006A, Problem 3

February 5, 2006
ratioAMC

Problem Statement

The ratio of Mary's age to Alice's age is 3:5 3: 5. Alice is 30 30 years old. How old is Mary? <spanclass=′latex−bold′>(A)</span>15<spanclass=′latex−bold′>(B)</span>18<spanclass=′latex−bold′>(C)</span>20<spanclass=′latex−bold′>(D)</span>24<spanclass=′latex−bold′>(E)</span>50 <span class='latex-bold'>(A) </span> 15\qquad <span class='latex-bold'>(B) </span> 18\qquad <span class='latex-bold'>(C) </span> 20\qquad <span class='latex-bold'>(D) </span> 24\qquad <span class='latex-bold'>(E) </span> 50
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