HELP - MATH - Adding 3 ages up to equal 150
Write an equation that models how old in years each of you will be, when your ages add up to 150 years old. For example, if x = your age and the eldest person was a year older than you, you would write their age as x + 1. Then the equation would be: x + (x+1) = 150. Explain the reasoning which helped you develop your equation. Solve for your future ages. Are your answers reasonable, do they add up to 150?
The ages are 30, 47, and 10. The difference between my age and the oldest person is 17 years. I know it is x + (x+17)= 150. I know this is very simple but I am stuck and need some help understanding this.