Jason is 11 times older than zack. the sum of their ages is 48. how old is zack?

Let j = Jason's age
Let z = Zack's age

j = 11z // Jason is 11 times older than zack
j + z = 48 // The sum of their ages in 48

j = 11z becomes j - 11z = 0

j - 11z = 0
j + z = 48
Multiply the top equation by -1

-1(j - 11z) = (0)-1
-j + 11z = 0

-j + 11z = 0
j + z = 48

Add both equations to cancel the j terms.

12z = 48

Divide both sides by 12.

z = 4

Zack is 4 years old and Jason is 44 years old.

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.