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Mathematics, 28.11.2019 23:31 eli761029

1) joão tem 100 moedas, umas de 10 centavos e outras de 25 centavos, fazendo um total de r$20,20. determine o número de moedas de 25 centavos que joão possui.

2) dois grupos de amigos foram à feira e pararam diante de uma banca que vendia pastéis e caldo de cana. o primeiro grupo pagou r$5,40 por um pastel especial e dois copos de caldo de cana. o segundo grupo pagou r$9,60 por três copos de caldo de cana e dois pastéis especiais. a diferença entre o preço de um pastel especial e o preço de um copo de caldo de cana foi de:

(a) r$2,00
(b) r$1,80
(c) r$1,50
(d) r$1,20

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