Pipe A and B can fill the pool in 30 minutes and 40 minutes, respectively. Pipe C can empty half filled pool in 30 minutes. If all the pipes are opened together, then find the time taken to fill the empty pool completely
Time taken by pipe C to empty the full pool = 30 × 2 = 60 minutes Let the capacity of pool = 120 units Number of units of water filled by pipe A alone in one minute = 120/30 = 4 units Number of units of water filled by pipe B alone in one minute = 120/40 = 3 units Number of units of water emptied by pipe C alone in one minute = 120/60 = 2 units Required time taken = 120/(4 + 3 – 2) = 24 minutes
2222 ÷ 22 + 992 ÷ 16 + 650 ÷ 25 = ?
30% of 8/5 × 5/7 × 2870 =?
(-251 × 21 × -12) ÷ ? = 158.13
464 + 181 +? = (154 × 25) - (15) 2
2852 + 7848 + 2962 + 4268 = ? – 1460
168 163 153 138 118 ?
...√256 × 25 – 15 × 14 =?
7/11 × 1034 + 1(4/7) × 2401 = 1230 +?
60% of 60 + 40% of ? = 75% of 160 - 30% of 120