##phase rule and steels##
##problem 1##
import math
pc_tin=(73./100.)##% composition of tin in alloy##
eutectic_tin=64.##% composition of tin in eutectic alloy##
wt_alloy=1.##weight of alloy in terms of kg##
w=wt_alloy*1000.##weight of alloy in terms of gms##
wt_tin=pc_tin*w##wight of tin in alloy(gms)##
wt_lead=w-wt_tin##wight of lead in alloy(gms)##
wt_eutectic_tin=wt_lead*eutectic_tin/(100.-eutectic_tin)##weight of eutectic tin(gms)##
To=wt_lead+wt_eutectic_tin##total mass of eutectic alloy(gms)##
print'%s %.2f %s'%("\nTotal mass of eutectic in alloy is ",To," g");