Sixth grade math! Speed! 1: A cuboid glass fish tank without cover, measured from the outside, is 60cm long, 40cm wide and 50cm high. Given that the glass is 3cm thick, what is the maximum volume of the fish tank? 2: A 40 cm long, 30 cm wide rectangular sheet iron, four corners of each cut a side length of 5 cm square, make a 5 cm deep uncovered rectangular iron box. How many cubic centimeters is the volume of this iron box?

Sixth grade math! Speed! 1: A cuboid glass fish tank without cover, measured from the outside, is 60cm long, 40cm wide and 50cm high. Given that the glass is 3cm thick, what is the maximum volume of the fish tank? 2: A 40 cm long, 30 cm wide rectangular sheet iron, four corners of each cut a side length of 5 cm square, make a 5 cm deep uncovered rectangular iron box. How many cubic centimeters is the volume of this iron box?

1. From the inside,
Length 60-3-3 = 54 cm
Width 40-3-3 = 34 cm
Height 50-3 = 47 cm
Volume 54 × 34 × 47 = 86292 CC
2. Made into a cuboid
Length 40-5-5 = 30cm
Width 30-5-5 = 20 cm
Height 5 cm
Volume 30 × 20 × 5 = 3000 cubic centimeter