Question
PSLE
A box contained red balls and black balls. 40% of the balls were black. After some yellow balls were added to the box, 32% of the balls were black. What percentage of the balls in the box were yellow?
2 m

Click button first when a symbol is required. X

PSLE
A box contained red balls and black balls. 40% of the balls were black. After some yellow balls were added to the box, 32% of the balls were black. What percentage of the balls in the box were yellow?