Davids brother is 3 yrs older than him and the total age of them is 17. How old is david?
d + d+3 = 17
To find out David's age, we'll set up an equation based on the information given. Let's call David's age "x". According to the question, David's brother is 3 years older than him, so his brother's age would be "x + 3".
The total age of David and his brother is 17, so we can set up the equation:
x + (x + 3) = 17
Now, let's solve for x:
2x + 3 = 17 (Combine like terms)
2x = 17 - 3 (Subtract 3 from both sides)
2x = 14 (Simplify)
x = 14 / 2 (Divide both sides by 2)
x = 7 (Simplify)
Therefore, David is 7 years old.