Question
PSLE
At first, Leah had a total of 121 green and grey balloons. 13 grey balloons burst. She then increased the number of green balloons by 90%. After that, Leah had a total of 180 balloons. How many grey balloons did she have at first?
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PSLE
At first, Leah had a total of 121 green and grey balloons. 13 grey balloons burst. She then increased the number of green balloons by 90%. After that, Leah had a total of 180 balloons. How many grey balloons did she have at first?