# Sally has 100 marbles and her brother has 300 marbles. Express Sally's marbles as a percentage of the total number of marbles they have altogether.

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" " " her brother has = 300

total marbles = 400

% of marbles sally has = 100/400 X 100 = 25%

No.of marbles Sally has=100 marbles

therefore,Percentage of marbles Sally has=(100/600*100)=50/3=16.66%