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In a series parallel circuit, you have to use the specific characteristics of series or parallel

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in each branch of the circuit. In the circuit, you can see here there is a resistor in series

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with two that are in parallel. Firstly, calculate the equivalent resistance.

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You calculate the resistors that are in parallel and then add the one that is in series.

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The second question is the total current, remember is always the voltage of the cell

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divided by the equivalent resistance. In this exercise they are asking for the currents trough

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each resistor, the resistor 1 is in series with the cell, so the intensity is the same that in

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the circuit. But this intensity is divide between the two resistors in parallel. The voltage here

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is not the voltage of the cell. You can calculate it because the voltage is the difference between

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the voltage of the cell and the voltage of the resistor 1. Other way to calculate the intensities

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is through the divisor of intensities. It is a proportion between the equivalent resistance in

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the parallel branch and the resistance of each of the parallel resistors. You decide with way is easier.