Jeff has 20 five-dollar and ten-dollar bills in his wallet. The total value of these bills is $125. How many bills of each denomination does he have?
+36916 f = 5 bills value = 5f
t = 10 bills = 20-f value = 10(20-f) summed = 125
5f + 10(20-f) = 125
-5f = -75 You can take it from here .....
