Robert is 15 years older than his sister, Helen. The sum of their ages is 63. Find their ages.
x is Helen's age
(x + 15) is Robert's age
x + (x + 15) = 63
2x = 48
x = 24
Let x = Helen's age and x+15 = Robert's.
x + (x+15) = 63
Solve for x, then x+15.
alyssa is twice as old as janna three years from now the sum of thier age will be 42 how old alyssa
Siri, who is not yet 22 year old
To solve this problem, we can use algebraic equations. Let's assume Helen's age is x.
According to the problem, Robert is 15 years older than Helen. So, Robert's age would be x + 15.
The sum of their ages is 63, which we can write as an equation:
x + (x + 15) = 63
By combining like terms, the equation becomes:
2x + 15 = 63
To isolate x, we subtract 15 from both sides of the equation:
2x + 15 - 15 = 63 - 15
2x = 48
Finally, we divide both sides of the equation by 2 to solve for x:
2x/2 = 48/2
x = 24
Thus, Helen is 24 years old.
To find Robert's age, we substitute the value of x back into the expression for Robert's age:
Robert's age = x + 15 = 24 + 15 = 39.
Therefore, Robert is 39 years old.