Question
PSLE
Cathy had two streamers of the same length. She cut the first streamer into equal parts of length 90 cm and to each part she tied 4 black stars. After that, she cut the second streamer into equal parts of length 100 cm and to each part she tied 5 green stars. When she finished tying, she counted that there were 20 more green stars than black stars. How many stars were there altogether?
5 m

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PSLE
Cathy had two streamers of the same length. She cut the first streamer into equal parts of length 90 cm and to each part she tied 4 black stars. After that, she cut the second streamer into equal parts of length 100 cm and to each part she tied 5 green stars. When she finished tying, she counted that there were 20 more green stars than black stars. How many stars were there altogether?