Taking into account the change of units, the correct answer is the last option: 5 mL equals 0.00005 hectoliters.
The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied with the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b) ÷a
The direct rule of three is the rule applied in this case where there is a change of units.
To perform in this case the conversion of units, you must first know that 1 mL= 0.00001 hectoliters.
So, you can apply the following rule of three: if 1 mL equals 0.00001 hectoliters, 5 mL equals how many hectoliters?
1 mL ⇒ 0.00001 hectoliters
5 mL ⇒ x
So: x=(5 mL× 0.00001 hectoliters)÷ 1 mL
Solving:
x= 0.00005 hectoliters
In summary, the correct answer is the last option: 5 mL equals 0.00005 hectoliters.
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