Question 100409
Let x=Caridad's sister's age now

Then x+6=Caridad's age now

And(x+6)-4=Caridad's age 4 years ago

x-4 =Caridad's sister's age 4 years ago

Now we are told that:

(x+6)-4=4(x-4) get rid of parens

x+6-4=4x-16  simplifying
x+2=4x-16   subtract 2 and also 4x from both sides

x+2-2-4x=4x-4x-2-16  collect like terms

-3x=-18  divide both sides by -3

x=6 -----------------Caridad's sister's age now

x+6=6+6=12-------------------------------Caridad's age now--ans

CK

Caridad is 6 years older than her sister
12=6+6
12=12
And
6-4=12-4
2*4=8
8=8


Hope this helps----ptaylor