Answer:

0.03617 kg

Step-by-step explanation:

CONVERSION UNITS:

1 gram (g) = 0.001 kilogram (kg)

1 decigram (dg) = 0.1 gram = 0.0001 kg

1 centigram (cg) = 0.01 gram = 0.00001 kg

Solution:

Convert all other units to kilograms and add them,

[tex]34 \: g = 0.034 \: kg \\ 21 \: dg = 0.0021 \: kg \\ 7 \: cg = 0.00007 \: kg[/tex]

Now on adding we get the final answer

[tex]0.034 + 0.0021 + 0.00007 = 0.03617 \: kg[/tex]