Problema Solution
Mary is 4 times as old as her brother Charlie.In four years, Mary will be twice as old as her brother.How old is Mary/ How old is Charlie.
Answer provided by our tutors
let 'x' represent the age of Charlie, then '4x' represents the age of Mary
Mary 4 years later is '(4x+4)' years old and Charlie will be '(x+4)' years old.
May will be twice as old as Charlie in 4 years:
(4x+4)=2(x+4)
x=2
4*2=8
May is 8 years old, Charlie is 2 years old.