Question
PSLE
At first, Leah had a total of 67 black and brown balloons. 10 brown balloons burst. She then increased the number of black balloons by 75%. After that, Leah had a total of 72 balloons. How many brown balloons did she have at first?
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PSLE
At first, Leah had a total of 67 black and brown balloons. 10 brown balloons burst. She then increased the number of black balloons by 75%. After that, Leah had a total of 72 balloons. How many brown balloons did she have at first?