Question
Pipes A, B, and C can fill a tank in 30 minutes, 45
minutes, and 60 minutes respectively. All the pipes are opened together. A is closed after n minutes, and B is closed (2n - 2) minutes before the tank is filled. If the tank is filled in 28 minutes, find the value of n.Solution
Let the total capacity of tank be 180 litres (LCM of 30, 45, 60)
Efficiency of A = 180 ÷ 30 = 6 litres/minute
Efficiency of B = 180 ÷ 45 = 4 litres/minute
Efficiency of C = 180 ÷ 60 = 3 litres/minute So,
(6 + 4 + 3) × n + (4 + 3) × (28 - n - (2n - 2)) + 3 × (2n - 2) = 180
Or, 13n + 7(30 - 3n) + 6n - 6 = 180
Or, 13n + 210 - 21n + 6n - 6 = 180
Or, -2n + 204 = 180
Or, n = 12
Find out which of the figures (1), (2), (3) and (4) can be formed from the pieces given in figure (X) .
From the given answer figures, Select the one in which the question is hidden/embedded.
Find out the alternative figure which contains figure (X) as its part.
Select the option in which the given figure is embedded.
Select the option figure which is embedded in the given figure. (Rotation is NOT allowed)
Select the option in which the given figure is embedded (rotation is not allowed)
Select the option figure which is embedded in the given figure. (Rotation is not allowed).
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