Question 1209399
<font color=black size=3>
Start at the bottom and work your way up.


5a = 20 means a = 4
4a+5b = 16 leads to 4*4+5b = 16 which yields b = 0
3a+4b+5c = 15 leads to 3*4+4*0+5c = 15 which yields c = 3/5
And so on.


The solution you should end up at is <font color=red>(a, b, c, d, e) = (4, 0, 3/5, 118/25, 408/125)</font>


3/5 = 0.6
118/25 = 4.72
408/125 = 3.264
Each decimal value is exact and hasn't been rounded.
</font>