Electric energy

There are 875 identical light bulbs in the sports hall lighting for 2 hours. How long does the same amount of electricity consume 100 such bulbs?

Correct result:

t =  17.5 h

Solution:

$t=875\cdot 2\mathrm{/}100={\displaystyle \frac{35}{2}}={\displaystyle \frac{35}{2}}\text{ h}=17.5\text{ h}$

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