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1)energy consumed by 1 bulb = 10w
energy consumed by 10 such bulbs = 100w
energy consumed by 1 fan = 100w
energy consumed by 5 such fans = 500w
total energy consumed = 100w+500w=600w=.6kw
2) The total number of protons and neutrons in an atom. So in the given symbol mass number of phosphorus is 31
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