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P.S. I'm not asking for the actual answer, I just need to know how to, so clues or reminders regarding the fundamentals would be fine by meenter image description here

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    \$\begingroup\$ yes, it looks like the value of current flowing through the circuit is missing \$\endgroup\$ May 7 at 6:23
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    \$\begingroup\$ Is it possible that the red arrow had a current value marked next to it? \$\endgroup\$
    – Nedd
    May 7 at 6:28
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    \$\begingroup\$ Surely you must have some other details about this circuit. Otherwise you have a system of 3 variables with 2 unknowns... \$\endgroup\$
    – andrew
    May 7 at 8:03
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The current was indeed missing from the given values. The H.S. Physics teacher who made this question admitted that he didn't know what he was doing when making these questions.

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As Andrew said, you have a system of single equation with two variables. If you would like to act smartypants to your teacher you could give him the following answer:

Mathematically it is solvable, the drawback is that there are infinitely many solutions :D.

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