SOLUTION: how many gallons of 70% antifreeze should be mixed with 10 gallons of 30% antifreeze to obtain 45% antifreeze.

Question 446083: how many gallons of 70% antifreeze should be mixed with 10 gallons of 30% antifreeze to obtain 45% antifreeze.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
------ percent ---------------- quantity
Antifreez1 I 80---------------- 40 gallons
Antifreeze II 10----------------x gallons
Total 30 ----------------40+x gallons
30*10+70*x=45(10+x)
300+70x=450+45x
70x-45x=450-300
25x=150
/25
x=6 gallons 70 % Antifreeze II

RELATED QUESTIONS
How many gallons of 40% antifreeze should be mixed with 10 gallons of 85% antifreeze to... (answered by stanbon)

how many gallons of 20% antifreeze should be mixed with 10 gallons of 83% antifreeze to... (answered by stanbon,josgarithmetic)

how many gallons of 20% antifreeze should be mixed with 10 gallons of 10% antifreeze to... (answered by Alan3354)

How many gallons of 20% antifreeze should be mixed with 10 gallons of 101% antifreeze to... (answered by Alan3354)

How many gallons of 20% antifreeze should be mixed with 10 gallons of 92% antifreeze to... (answered by Alan3354)

how many gallons of 30% antifreeze should be mixed with 10 gallons of 75% anitfreeze to... (answered by richwmiller)

How many gallons of 60% antifreeze should be mixed with 40% antifreeze to make 80gallons... (answered by richwmiller)

How many gallons of 70% antifreeze should be mixed with 10 gallons of 30% antifreeze to... (answered by richwmiller)

How many gallons of 40% antifreeze should be mixed with 10 gallons of67% antifreeze... (answered by addingup,fractalier)