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Mathematics, 13.10.2020 23:01 kentavonwilliam

Det är 95 personer som har betalat entré till en utställning. Biljetterna kostar 80 kr/st. Efter utställningen fanns 88 sedlar i kassan. De var av valörerna 20 kr och 100 kr. Hur många av sedlarna var 20 kr-sedlar?

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