Question 181880
a)  Just assign some variables.  Let's choose S to be the hours for Samantha and A for Adrianna.

b)  S = 2 * A

c)  S + A = 39

d)  Substituting (b) into (c)...  2 * A + A = 39 .... 3 A = 39 ... A = 13

    Substituting back into (b) .... S = 2 * 13 = 26


Hope this helps, Troy.