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Super difficult math problem in grade five
1. The school shipped 43.2 cubic meters of fine sand. How many decimetres of sand can a long jump pit with a length of12m and a width of 7.2m be paved?

2. A rectangular pool can store 12.6 tons of water. It is known that the pool is 6 meters long and 3 meters wide. How deep is it? (1 m3 water weight 1 ton. Solve by equation)

3. There is a cuboid oil drum with a side length of 2 decimeters. Pour the oil in it into a 500 ml bottle and fill it with 60 bottles. How deep is the oil in this oil drum?

4. A rectangular iron sheet with a length of 50 cm and a width of 45 cm is punched into a box after cutting small squares with a bottom length of 10 cm from four corners. How many cubic centimeters can this box hold?

Answer:

1. The school shipped 43.2 cubic meters of fine sand. How many decimetres of sand can a long jump pit with a length of12m and a width of 7.2m be paved?

43.2 ÷12 ÷ 7.2 = 0.5m =5 decimeters

2. A rectangular pool can store 12.6 tons of water. It is known that the pool is 6 meters long and 3 meters wide. How deep is it? (1 m3 water weight 1 ton. Solve by equation)

Let the water depth be x meters.

6×2×X= 12.6× 1

x = 12.6÷ 12 = 1.05m。

3. There is a cuboid oil drum with a side length of 2 decimeters. Pour the oil in it into a 500 ml bottle and fill it with 60 bottles. How deep is the oil in this oil drum?

500ml = 0.5L。

0.5× 60 ÷ 2 2 = 7.5 decimeter

4. A rectangular iron sheet with a length of 50 cm and a width of 45 cm is punched into a box after cutting small squares with a bottom length of 10 cm from four corners. How many cubic centimeters can this box hold?

(50-2×10 )× (45-2×10 )×10 = 7500 cubic centimeters.