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Start learning 50% faster. Sign in nowGiven: A + C together can paint the wall in 18 days ⇒ Work rate = 1/18 C alone can do it in 36 days ⇒ Work rate = 1/36 C works for 27 days after A leaves Let A and C work together for x days Work by A + C = x × 1/18 Work by C alone = 27 × 1/36 = 3/4 Total work = 1 So, x/18 + 3/4 = 1 x/18 = 1 - 3/4 = 1/4 x = 1/4 × 18 = 4.5 days A's individual rate = 1/18 - 1/36 = 1/36 A’s work in 4.5 days = 4.5 × 1/36 = 1/8 Hence, A completed 1/8 = 12.5% of the work
Tungsten is used for the manufacture of the filament of an electric bulb, because –
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Which of the following is not a vector quantity?
The polarization of electromagnetic waves demonstrates that they are:
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Which of the following is an example of a non-renewable source of energy?
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Which physical quantity has unit “Joule/second”?
The balance point in a potentiometer for a cell of emf 1.5 V is 60 cm. If a resistance of 5 Ω is connected in parallel with the cell and the new balanc...