A car radiator contains 5 liters of a 25% solution of antifreeze. How many liters must be removed and replaced by a 75% antifreeze solution to leave the radiator
filled with a 55% antifreeze solution?

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

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step-by-step explanation: