583.9 + 1519.98 - 445.21 = 1150.011 + ?
583.9 + 1519.98 - 445.21 = 1150.011 + ? => 584 + 1520 - 445 = 1150 + ? => ? = 1659 – 1150 => ? = 509
Tungsten is used for the manufacture of the filament of an electric bulb, because –
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