Question
PSLE
At first, Leah had a total of 73 white and black balloons. 13 black balloons burst. She then increased the number of white balloons by 75%. After that, Leah had a total of 84 balloons. How many black balloons did she have at first?
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PSLE
At first, Leah had a total of 73 white and black balloons. 13 black balloons burst. She then increased the number of white balloons by 75%. After that, Leah had a total of 84 balloons. How many black balloons did she have at first?