Siblings collect a 2-crowns and 5-crowns. Together have 80 coins with a total of value 310 crowns. How many saved two-crowns and how many five-crowns?


n(2) =  30
n(5) =  50


a+b = 80
2a+5b = 310

a+b = 80
2a+5b = 310

a = 30
b = 50

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