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 is
Simplifying,
The number is
Check: 4 times number = 40. 40 + 10 = 50
6 times number = 60. 60 - 10 = 50. Correct!
Hope you got it :)