Some bananas are packed into a box in stacks. Each stack has the same number of bananas in each row as the number of rows. The number of stacks is also the same as the number of rows. If there are 44 stacks of bananas in the box, what is the total number of bananas in the box?
A shopkeeper sells two qualities of wheat at the rates of ₩36 per kg. and ₩38.5 per kg, gaining 20% and 10% profit respectively. If he mixes the two variants in the ratio 2:3 and sells the mixture at ₩39.6 per kg., what is his gain% or loss%?
Woojin and Jiwoo sit on the 10-member board of directors for company X. If the board is to be split up into two 5-person subcommittees, what is the percentage that Jiwoo and Woojin are included in the same sub-committee?
Pump A can fill a tank in 42 minutes, while pump B can fill the same tank in 7 minutes. Both pumps are turned on together to fill the empty tank, but when tank became half full, pump B stops working and rest of the tank is filled by pump A only. How long it took to fill the tank?