SOLUTION: 1. a farmer bought 85 kg of fertilizer in 12 bags. some are 5 kg bag. the rest are 10 kg bags. how many 5 kg bags did he buy?

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Question 979441: 1. a farmer bought 85 kg of fertilizer in 12 bags. some are 5 kg bag. the rest are 10 kg bags. how many 5 kg bags did he buy?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=12,
5*x+10*y=85
x=12-y
5*(12-y)+10*y=85
60-5y+10*y=85
5*y=25
y=5
x=12-y
x=7 at 5 and y=5 at 10
check
7+5=12
5*x+10*y=85
5*7+10*5=85
35+50=85
85=85
ok
codetick