Question

A petrol tanker contains 20000 liters of petrol express the quantity of petrol in kilolitres and milliliters

Answer 1

for kilolitres divide by 1000
for millimeters multiply by 1000
answer is 20kl and 20000000ml

Answer 2

20000 litres
1kilileter =1000 liters 
then 20000 litres=20000/1000=20 kiloleter
1 millilitres=0.001 litres 
then 20000 litres=20000/0.001=20000000