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[deunforgiven]

there's a missing given .
power of each lamp is 25 watts. from which u can determine resistance of each lamp using the 5 amperes current so .. from (V/I)-r u can find total resistance ((110/5)-2 = 20 ohm)2 .
now u have R=20 ohm , use equation of power to find R of each lamp
25=I**2)R)
therefore R of each = 1 ohm
20 = NR