Question
PSLE
At first, Leah had a total of 70 black and grey balloons. 19 grey balloons burst. She then increased the number of black balloons by 75%. After that, Leah had a total of 81 balloons. How many grey balloons did she have at first?
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PSLE
At first, Leah had a total of 70 black and grey balloons. 19 grey balloons burst. She then increased the number of black balloons by 75%. After that, Leah had a total of 81 balloons. How many grey balloons did she have at first?