Question
Pipe P can fill a cistern in 12 hours and pipe Q in 20
hours. If both the pipes are opened in an empty cistern, how much time will they take to fill it?Solution
Let the capacity of tank be 60 litres (LCM of 12 and 20)
Efficiency of 'P' = (60 / 12) = 5 litres/hour
Efficiency of 'Q' = (60 / 20) = 3 litres/hour
Required time = 60 ÷ (5 + 3) = 7.5 hours
13 182 303 384 433 ?
...1 4 13 46 ? 976
...Four terms are in proportion. The first, second and fourth terms are 4, 22, and 33. Find the third term.
5 4 29 24 185 ?
3, 7, 16, 35, ?, 153
The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the questions...
8 24 48 144 ? 864
...12, 18, 28, 42, 52, ?
4 5.5 19 .5 98.5 694 6251.5...
21 84 168 172 ? 348
...
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