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:

$t=875 \cdot \ 2 / 100=\dfrac{ 35 }{ 2 }=17.5 \ \text{h}$

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