Answer :

tytr2323
what is 100% of the mass ?

apologiabiology
15%=45
divide 3
5%=15
double
10%=30
double
20%=60


60 grams

legit way
percent/mass=15/45=1/3

1/3=20/?
times both sides by 3?
?=3*20
?=60


60g

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