Question
Pipes 'G' and 'H' can fill a tank in 15 and 20 minutes
respectively. A leak opens when the tank is half full, removing (2/7)th of the water supplied. What is the total time to fill the tank?Solution
Capacity = 60 litres (LCM of 15 and 20)
'G' = 60 ÷ 15 = 4 litres/min
'H' = 60 ÷ 20 = 3 litres/min
Time to fill half = 30 ÷ (4 + 3) = 30 ÷ 7 = 4.29 minutes
Effective rate = (5/7) × 7 = 5 litres/min
Time to fill remaining = 30 ÷ 5 = 6 minutes
Total time = 4.29 + 6 = 10.29 minutes
7    7       14    42   ?     840
...65    69   77 93  ?    189
203, 223, 198, 218, ?, 213
31Â Â Â 32Â Â Â Â 41Â Â Â Â 66Â Â Â 115Â Â Â Â ?
90     211     67     236     ?     265
...398Â Â Â 308Â Â Â 228Â Â Â 158Â Â Â 98Â Â Â ?
A series is 11, 20, 42, 82, 166, 330
If another series 4, a, b, c, d, 106 follows the same pattern as the given number series, then find the appr...
32, ?, 41, 68, 132, 257
...3601 3602 1803 604 154 36
...979.001 + 4.0087 × 82.79 = ?
...
