240L of 90% solution is used to make solution.
Let, the quantity of 75% antifreeze solution be x and 90% antifreeze solution be y.
360 is the total quantity of the mixture
x + y = 360 (1)
Also the final solution is 85% solution
75 % of x + 90% of y = 85% of 360
0.75x + 0.90y = 0.85 × 360
0.75x + 0.90y = 306
75x + 90y = 30600 (2)
by solving equation 1 and 2 we get
15y = 3600
y = 240
Therefore, 240L of 90% solution is used to make solution.
Any material that lowers water's freezing point is an antifreeze, and it works to prevent ice from forming and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.
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