The resistance across first bulb is
The resistance across second bulb is
The voltage across the builbs is .
The formula to calculate the power dissipated in first bulb is,
Here, is the power dissipated in first bulb, V is the voltage and is the resistance across first bulb.
Substitute the khown values in the formula to calculate the power dissipated in first bulb.
The formula to calculate the power dissipated in second bulb is,
Here, is the power dissipated in first bulb and is the resistance across second bulb.
Substitute the known values in the formula to calculate the power dissipated in second bulb.
Thus, the power dissipated in first bulb is and the power dissipated in second bulb is
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