AMC 12A 2020 Problem 1

Past Contests AMC 12 AMC 12A - 2020
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1

Carlos took 70 \% of a whole pie. Maria took one third of the remainder. What portion of the whole pie was left?

Answer Choices
A. 10 \%
B. 15 \%
C. 20 \%
D. 30 \%
E. 35 \%