Question

3dl+?dl=1l 40cl+?cl=1l 400ml+?ml=1l 95cl+?cl=1l 1l=60cl+?cl 1l=1dl+?dl 1l=455ml+?ml 1l=655ml+?ml

Answer 1

3 dl + ? dl = 1 l

* 1 l = 10 dl

3 + x = 10
x = 10 - 3
x = 7 dl
--------
40 cl + ? cl = 1 l

*1 l = 100 cl

40 + x = 100
x = 100 - 40
x = 60 cl
------------400 ml + ? ml = 1 l

*1 l = 1000 ml

400 + x = 1000
x = 1000 - 400
x = 600 ml
------------
95 cl + ? cl = 1 l

*1 cl = 100 l

95 + x = 100
x = 100 -  95
x = 5 cl
---------
1 l = 60 cl + ? cl

*1 l = 100 cl

100 = 60 + x
60 + x =100
x = 100 - 60
x = 40 cl
----------
1 l = 1 dl + ? dl

* 1 l = 10 dl

10 = 1 + x
1 + x = 10
x = 10 - 1
x = 9 dl
----------
1 l = 455 ml + ? ml

* 1 l = 1000 ml

1000 = 455 + x
455 + x = 1000
x = 1000 - 455
x = 545 ml

1 l = 655 ml + ? ml

*1 l = 1000 ml

1000 = 655 + x
655 + x = 1000
x = 1000 - 655
x = 345 ml 

Answer 2

3dl+7dl=10dl= 1l
40cl+60 cl=1l
400ml+600 ml=1l
95 cl+5cl =1l
1l=60cl+40cl
1l=1dl+9dl
1l=455ml+545ml
1l=655ml+345ml