Question
PSLE
A box contained yellow balls and red balls. 70% of the balls were red. After some brown balls were added to the box, 49% of the balls were red. What percentage of the balls in the box were brown?
2 m

Click button first when a symbol is required. X

PSLE
A box contained yellow balls and red balls. 70% of the balls were red. After some brown balls were added to the box, 49% of the balls were red. What percentage of the balls in the box were brown?