<PRE><B>Question 664952</B>
 In four years time Angela will be twice as old as Barry and four times as old as Carol.
a + 4 = 2(b+4)
a + 4 = 2b + 8
a = 2b + 8 - 4
a = 2b + 4
and
a + 4 = 4(c+4)
a + 4 = 4c + 16
a = 4c + 16 - 4
a = 4c + 12
:
 Three years ago Angela was three times as old as Barry.
a - 3 = 3(b-3)
a - 3 = 3b - 9
a = 3b - 9 + 3
a = 3b - 6
:
a = a, so we can write an equation
3b - 6 = 2b + 4
3b - 2b = 4 + 6
b = 10 yrs old
:
Find a
a = 3(10) - 6
a = 24 yrs old
:
Find c
4c + 12 = a
4c + 12 = 24
4c = 24 - 12
4c = 12
c = 3 yrs old
:
 How old are Angela, Barry and Carol now? 24, 10, 3</PRE>