Following chart shows average score of players in a cricket tournament. Players who scored with an average of 40 or more, would be selected for next tournament. If 170 players participated in the tournament, find the number of players who qualify for next tournament.

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 84 stacks of bananas in the box, what is the total number of bananas in the box?

Woojin sells his two bikes at the rate of ₩ 4 lacs each. On one bike he gains 3% while on other bike he incurs a loss of 3%. Find his total loss/gain in whole transaction.

Pump A can fill a tank in 10 minutes, while pump B can fill the same tank in 15 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?

A water tank has two types of taps (type-A and type-B). A tap of type-A can fill the tank in 26 minutes, while a tap of type-B can fill the same tank in 39 minutes. If there are 3 type-A taps and 2 type-B taps that can be used to fill the tank, how long will it take to fill an empty tank?