Susie baked 50 more chocolate cupcakes than strawberry cupcakes. She sold 3/5 of the chocolate cupcakes and 1/2 of the strawberry cupcakes. Then, she had 137 cupcakes left. How many cupcakes did Susie bake in all?
+37153 c = 50 + s
then
c - 3/5 c + s - 1/2 s = 137
2/5 c + 1/2 s = 137 Plug in the red equation for c ....then solve for s then solve for c = 50 + s then add together
