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Put pod noge | On My Way #4

Karta za gradski autobus u Moskvi iznosi 5 kopjejki. Na jednoj je stanici u autobus ušlo 20 putnika, od kojih nijedna osoba nije imala kovanica manjih od 10 kopjejki. Međusobno su razmijenili novac i u kasu položili 100 kopjejki. Imajući na umu da postoje kovanice od 10, 15 i 20 kopjejki, koliko su najmanje kovanica ukupno mogli imati prilikom ulaska u autobus?
City bus fare in Moscow is 5 kopeks. At one bus stop 20 passengers boarded the bus, none of whom had coins under 10 kopeks. They exchanged money between themselves and put 100 kopeks in the cashbox. Keeping in mind that there are coins of 10, 15 and 20 kopeks, what is the minimum number of coins they all could have had when they boarded the bus?