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Five times the sum of a number and 4 is-15The sum of three times a first number and twice a second number is 42 . If the second number is subtracted from twice the first number, the result is 14 . Find the first number.Find three consecutive even integers such that the sum of the smallest number and twice the middle number is 20 more than the largest number.The sum of twice a number and half the number is 10A new television set was recently purchased for the common room in a Residence Hall for 432.60 including tax. If the tax rate is 3%, find the price of the television set before taxes.