Answer:
a.i) 1 piece = 20 days
1 day= 1/20 piece =0.05 of a piece
a.ii) 0.05*5 =0.25
a.iii) 0.05*10 =0.5 done.
so if the total is 1, 0.5 is half, so he has 0.5 work left
b.i)1 piece=12 days
4 days = 1/3 = 0.3333333333 of his work
b.ii)1/4=0.25
so 12*0.25 = 3 days
c.i)1/3 = 6 days
1 (work)= 6*3 = 18 days
c.ii) 1/18 = 1 day = 0.05555555555
c.iii) 0.5 since 9/18 = 1/2 = 0.5
d.i) 1 hour= 60 mins
whole tank = 60 mins
20 mins = 60/20 = 1/3 of a tank
if capacity = 1500L
1500 = 60 mins
1500/3 = 20 mins
=500 Liters
