What most be part of quantitative observations

Quantitative observations are performed with devices such as rulers, balances, measured cylinders, beakers, and regulators. ... the process of making an understanding based on observations and previous knowledge. Quantitative investigations always involve numbers.

Explanation:

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the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg