book Maths Puzzle Numerical Ability

prob. 94 The cost for a long distance phone call is 0.46 for the first minute,and 0.21 for additional minute or portion thereof.Write an inequality representing the number of minutes a person could talk without exceeding 3.00

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book Other Question
How many liters of a 14% alcohol solution must be mixed with 20 liters of a 50% solution to get a 30% solution? What is the sum of three consecutives even integers is 30 more than the largest.