If a right rectangular pyramid is sliced perpendicular to its base into two congruent pieces, which two-dimensional plane section could result from the slice?

Show me how you find y and determine what y is you i appreciate it : )

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?

Arestaurant needs to buy thirty-seven new plates. if each box has five plates in it, how many boxes will they need to buy?