Question
PSLE
A box contained white marbles and yellow marbles. 60% of the marbles were yellow. After some blue marbles were added to the box, 30% of the marbles were yellow. What percentage of the marbles in the box were blue?
2 m

Click button first when a symbol is required. X

PSLE
A box contained white marbles and yellow marbles. 60% of the marbles were yellow. After some blue marbles were added to the box, 30% of the marbles were yellow. What percentage of the marbles in the box were blue?