The diagram shows a segment of a circle such that CD is perpendicular bisector of the chord AB. Given that AB=16 and CD=4, find the diameter of the circle.
In a 3-digit number, the hundreds digit is sixtimes the tens digit while the units digit is seventimes the tens digit. Also, the sum of its digits is 14. Find the number.
There are a total of 16 chocolates - 4 each in the flavors of coffee, cherry, banana and grape. There are also 5 children. If each child is allowed to choose their own favorite flavor, what is the probability that all of them will get flavors of their choice?
Pump A can fill a tank in 6 minutes, while pump B can fill the same tank in 3 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?