Adam and Hassan had same stamps. If Hassan gave 80 stamps to Adam, Adam would have twice as many stamps as Hassan. If Hassan gave 110 stamps to Adam, Adam would have thrice as many stamps as Hassan. How many stamps did both have altogether?
+36916 h-80 =1/2 (a+80)
so h =1/ 2a +120
then
h-110 = 1/3 (a+110)
so h = 1/3 a + 110/3 + 110
equate the h's
1/2 a+120 = 1/3 a + 110/3 + 110
1/6 a = 110/3 + 110 - 120
a = 160 then h = 200 <====== you can add them together 
