Question

太好玩了o(^▽^)o

不好意思請問這題怎麼解？

) 8.有一元硬幣2個,五元硬幣五個,十元硬幣c個,且它們的總金額爲410元,若a:
b:cm1:2:3,則a+b+c=?(A)52 (B)56 (C)60 (D)64

Answer 1

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Ny-Ålesund

1*a + 5*b + 10*c = 410
且
a : b : c = 1 : 2 : 3 = k : 2k : 3k 代入上式

1*k + 5*2k + 10*3k = 410
41k = 410
k = 10

=> a = 10, b = 20, c = 30

a + b + c = 60