Question
PSLE
Jack had 20 more one-dollar notes than ten-dollar notes at first. He exchanged $140 worth of ten-dollar notes for one-dollar notes. How many more one-dollar notes than ten-dollar notes did Jack have after the exchange?
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PSLE
Jack had 20 more one-dollar notes than ten-dollar notes at first. He exchanged $140 worth of ten-dollar notes for one-dollar notes. How many more one-dollar notes than ten-dollar notes did Jack have after the exchange?