Question 141416
"Jennifer is 6 years older than Sue" __ J=S+6


"In 4 years, she will be twice as old as Sue was 5 years ago" __ J+4=2(S-5)


substituting __ (S+6)+4=2(S-5) __ S+10=2S-10 __ 20=S


substituting __ J=(20)+6 __ J=26