Robert is 27 years older than his son, and ten years from now, he will be twice as old as his son. how old is robert now?
Answer:
Now:
Robert: x+27
Child: x
Ten years from now:
Robert: x+37
child: x+10
x+37=2(x+10)
x+37=2x+20,
17=x
Correct the answer: x+27=17+27=44