<PRE><B>Question 1002432</B>
 Margo is currently twice as old as Joy was three decades ago,
m = 2(j-30)
m = 2j - 60
 and Joy is currently three times as old as Margo was two decades ago.
j = 3(m-20)
j = 3m - 60
replace m with (2j-60), from the 1st statement
j = 3(2j-60) - 60
j = 6j - 180 - 60
j = 6j - 240
240 = 6j - j
240 = 5j
j = 240/5
j = 48 yrs is Joy
Find Margo&#39;s age
 m = 2(48) - 60
 m = 96 - 60
 m = 36 yrs 
:
:
Check this in the 2nd statement
j = 3(m-20)
48 = 3(36 - 20)
48 = 3(16)
: 
 How old was Joy when Margo was born? 
48 - 36 = 12 yrs old</PRE>