Spiderman has $350 in his account and his earnings $25 per day. Batman has $200 in his account and earns $35 per day. After how many days, d, will Spiderman have more than Batman.
+230 350+25x is less then 200+35x
150 is less then 10
15 is less then x
So x is 16 days, our final solution.
