If u have 4 and add 12 take away 6 add 3 take away 10 add 3 whats the answer

In a box lenght 1m breadth 60 cm and height 40 cm small rectangular packets of dimension 5 cm into 8 cm into 10 cm are packed. how many such small packets can be packed in the big box?

Which expression gives you the distance between the points (5,1)and(9,-6)

Standard deviation of 19,29,21,22,23