clc
//initialisation of variables
p1=7.8//ft
p2=6.0//ft
p3=7.4//ft
p4=6.5//ft
p=7.6//ft
h=1.0//ft
h1=6.7//ft
p5=3.3//ft
//CALCULATIONS
D=p1-p2//mgd
D1=p1-p3//mgd
D2=p-p4//mgd
D3=p4+h//mgd
D4=h1-p5//mgd
//RESULTS
printf('the demand is taken =% f mgd',D3)