AMC 12 2006a Problem 7

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Mary is $20\%$ older than Sally, and Sally is $40\%$ younger than Danielle. The sum of their ages is $23.2$ years. How old will Mary be on her next birthday?

$\mathrm{(A) \ } 7 \mathrm{(B) \ } 8 \mathrm{(C) \ } 9 \mathrm{(D) \ } 10 \mathrm{(E) \ } 11$

Dataset text AMC 12 2000 to 2025. Quoted with source.

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