A 25 wad and a 100 watt bulbs are joined in series and connected to the mains. Which bulb will glow brighter ?

Resistance of 25 watt bulb
${\mathrm{R}}_1=\frac{{\mathrm{V}}^2}{\mathrm{P}}=\frac{(220{)}^2}{25}=1936\mathrm{\Omega }$
Resistance of 1oo watt bulb
${\mathrm{R}}_2=\frac{{\mathrm{V}}^2}{\mathrm{P}}=\frac{(220{)}^2}{100}=484\mathrm{\Omega }$
Series resistance $={\mathrm{R}}_1+{\mathrm{R}}_2=2420\mathrm{\Omega }$
Current through combination
$\mathrm{i}=\frac{200}{2420}=\frac{1}{11}$
Voltage across 25 watt bulb
$={\mathrm{R}}_1\times \mathrm{i}=\left(\frac{1936}{11}\right)=176 \mathrm{volt}$
Voltage across 100 watt bulb
$={\mathrm{R}}_2\times \mathrm{i}=(484/11)=44 \mathrm{volt}$
Hence 25 watt bulb will glow brighter