Five-crowns 4879

Eva had seven coins. Crowns, two-crowns, and five-crowns. At least two of each. How many did she have if she could buy three packs of gum for six crowns?

Correct answer:

a =  2
b =  3
c =  2

Step-by-step explanation:

x=3 6=18 a+b+c=7 x = 1 a + 2 b + 5 c a>1, b>1, c>1 c=2 a+2b = x2 5 a+b = 5 a=2 b=5a=52=3 k1=1 a+2 b+5 c=1 2+2 3+5 2=18 k2=a+b+c=2+3+2=7
b=3
c=2



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