Let the number be x 4 times the number = 4*x Sum of 4 times number + number itself = 4*x + x = 5*x This is given to be 10 less than 6 times the number, which can be expressed as 6*x - 10 Hence the equation isSimplifying, The number is Check: 4 times number = 40. 40 + 10 = 50 6 times number = 60. 60 - 10 = 50. Correct! Hope you got it :)