porfavor ayudenme dare corona a quien responda bien con procedimiento una sustancia tiene un volumen de 20 ml y una densidad de 4g /mlg ¿cual es la masa de esta sustancia?

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

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step-by-step explanation:

answer is b  

20

hope you get this one right.