Question

A fully charged battery is used to light a bulb for six days of continuous operation. If the same fully charged battery capacity is used to light five bulbs of similar power rating, how many days will the battery last?

• A. $1.2\text{days}$
• B. $30.0\text{days}$
• C. $12.0\text{days}$

Answer 1

The correct option is A $1.2\text{days}$

A fully charged battery can light 1 bulb for 6 days.
Then a fully charged battery can light 5 bulbs for $\frac{6}{5}$ days.

Using long division,

$\frac{6}{5}\text{days}=1.2\text{days}.$