Question 947161
B=brother's age;J=John's age=B+6
J+4=2(B+4) Substitute for J
(B+6)+4=2(B+4)
B+10=2B+8 Subtract 8 from each side
B+2=2B Subtract B from each side
2=B  John's brother is 2 years old
J=B+6=8 ANSWER John is 8 years old
CHECK
J+4=2(B+4)
8+4=2(2+4)
12=12