Question

900 +---------==2 litres

Answer 1

$1l = 1000g \\ 2l = 2000g \\ 2000 - 900 = 1100 \\ \\ \\ 900 + 1100 = 2l$

Answer 2

900 ml + ____ = 2 litres
Let the value = x
converting 2 litres in ml
1 litre = 1000 ml
2 litres = 2*1000 = 2000 ml
900 ml + x = 2000 ml
x = 2000 ml - 900 ml
x = 1100 ml


900 ml + 1100 ml = 2 litres