Sipho is 4 years older than his sister.Their combined age is 18.How old is sipho?
s + s + 4 = 18
2s = 14
s = 7
The sister is 7 years old.
Sipho=4x
Sister=x
x+x+4=18
2x=14
x=7
4(7)=28
What is this?
4(7)=28
To find Sipho's age, we can set up a system of equations. Let's use the variable "s" to represent Sipho's age and "x" to represent his sister's age.
We know that Sipho is 4 years older than his sister, so we can write the equation:
s = x + 4
We also know that their combined age is 18, so we can write the equation:
s + x = 18
Now, we can solve this system of equations to find Sipho's age.
Substitute the value of s from the first equation into the second equation:
x + 4 + x = 18
Combine like terms:
2x + 4 = 18
Subtract 4 from both sides:
2x = 14
Divide both sides by 2:
x = 7
Now that we know his sister's age is 7, we can substitute this value back into the first equation to find Sipho's age:
s = x + 4 = 7 + 4 = 11
Therefore, Sipho is 11 years old.