C is the third proportional of 29 and B. If B is the sum of the first three even natural numbers, then find the value of C.
(Rounded off to two decimal places)
If '+' means 'โ', 'โ' means 'ร', 'ร' means 'รท' and 'รท' means '+', then what will come in place of the question mark (?) in the following equation?
55 โ 8 รท 3 + 15 ร 5 = ?
Pipes A and B can fill an empty cistern in 84 minutes and 36 minutes, respectively. Both Pipe A and Pipe B are opened together. After how much time should Pipe B be turned off so that the empty cistern is completely filled in a total of 42 minutes?