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Mary, sally and danielle

Source: AMC 12 2006A, Problem 7

February 5, 2006
AMC

Problem Statement

Mary is 20% 20\% older than Sally, and Sally is 40% 40\% younger than Danielle. The sum of their ages is 23.2 years. How old will Mary be on her next birthday? <spanclass=′latex−bold′>(A)</span>7<spanclass=′latex−bold′>(B)</span>8<spanclass=′latex−bold′>(C)</span>9<spanclass=′latex−bold′>(D)</span>10<spanclass=′latex−bold′>(E)</span>11 <span class='latex-bold'>(A) </span> 7\qquad <span class='latex-bold'>(B) </span> 8\qquad <span class='latex-bold'>(C) </span> 9\qquad <span class='latex-bold'>(D) </span> 10\qquad <span class='latex-bold'>(E) </span> 11
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