1. Five times a number increased by twelve is eighteen. A. 5a + 12 = 18 B. 5a - 12 = 18 C. 18 = 5a + 12 D. 18 = 5a - 12 2. Fifty is equal to thrice a number increased by eleven. A. 3 + 11a = 50 B. 3a x 11 = 50 C. 50 = 3a - 11 D. 50 = 3a + 11 3. If six times a number is subtracted by five, the difference is fifty-five. A. 6a + 5 = 55 B. 6a - 5 = 55 C. 6a x 5 = 55 D. 6a + 5 = 55 4. The sum of four times a number and twelve is forty-eight.