Question 105637
I think you got it mixed up, maybe this will help explain it:
Write an equation each statement

"Courtney is 26 years older than Minili."
C = M + 26
;
Their age in 10 years:
C+10
and
M+10
:
"In 10 years, Courtney will be twice as old as Minili."
C + 10 = 2(M+10
C + 10 = 2M + 20
C = 2M + 20 - 10
C = 2M + 10 
:
How old is each of them now? 
From the 1st statement, Substitute (M+26) for C, find M
M + 26 = 2M + 10
26 - 10 = 2M - M
16 = M: just like you said
:
C = M + 26
C = 16 + 26
C = 42, just like you said
;
Check our solution in the statement:
"In 10 years, Courtney will be twice as old as Minili.
52 = 2(26) 
:
Not sure what your problem is, you had the right answer, hope this helps.