SOLUTION: the ratio of sand to cement is 6 to 5. how much cement is in a 220 kg mixture?

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Question 839798: the ratio of sand to cement is 6 to 5. how much cement is in a 220 kg mixture?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S%2FC=6%2F5
1.5S=6C
.
.
2.S%2BC=220
5S%2B5C=1100
Then substitute from eq. 1,
6C%2B5C=1100
11C=1100
C=100
Then from eq. 2,
S=220-100
S=120