We don't really do "ASAP". We have volunteers. If you want ASAP, you may wish to consider more expensive options.
Name Thnigs!!!!
M = Mr. Lin's Age
D = Daughter's Age
Now translate.
"Mr. Lin is four times as old as his daughter"
M = 4*D
"The sum of their ages is twelve years less than twice the difference of their age"
Sum of their ages: M+D
Difference of their Ages: M-D
Twice the Difference fo their Ages: 2(M-D)
12 less than Twice the Difference fo their Ages: 2(M-D)-12
M + D = 2*(M-D) - 12
We have assumed M > D, which is reasonable for a Father-Daughter relationship.
This translation was brought to you by "Writing Down Clear Defintiions".