Answer:
1. Capacity of the box in Litres: 7.917Lā8L
2. Volume of wood used in making the box: 1197cm^3
3. The mass of the box: 1496.25g/cm^3
Step-by-step explanation:
1. 29Ć21Ć13=7917cm^3
7917cm^3 ā 7.917dm^3ā7.917Lā8L
2. Outside Volume: 29Ć21Ć13=7917cm^3
Inside Volume: 28Ć20Ć13=6720cm^3
7917-6720=1197cm^3
3. 1197Ć1.25=1496.25g/cm^3