Question 43073
Let the first rainfall be x
Let the second rainfall be y
EQUATION 1:
x+y=55
y=55-x (subsitution)
EQUATION 2:
20x+40y=1800
20x+40(55-x)=1800
-20x=-400
x=20
y=55-20
y=35
Hence, the first rainfall was 20mlph and the second one was at 35mlph.
Paul.