Question

Please answer all correct and qickly.. i need for class 5..

1. Find the volume of a cube whose length, breadth and heights are 25 cm, 8 cm and 5.4 cm respectively. If the length is decreased by 3 cm, find the new volume.

2. Find the volume of a cube whose length, breadth and heights are 7 cm, 4
cm and 3.4 cm respectively. If the height is increased by 2.6 cm, find the
new volume.

3. How many small cubes of side 2 cm can be put in a cubical box of side
4 cm?

4. A cuboid measures 9 m x 6 m x 3 m. How many cubes of side 3 m can
fit in the box?

5. 100 water container of 5 ml capacity poured in a cuboid of 20 cm length
and 10 cm breadth. Find the height.

Answer 1

1st question

length of cuboid :- 25 cm

b of cuboid :- 8 cm

height of cuboid:- 5.4 cm

volume :- L × B × H

25 × 8 × 5.4

$1080 {cm}^{3}$

length is decreased by 3 cm

so new length :- 25-3 = 22 cm

now new volume = L × B × H

22 × 8 × 5.4

$950.4 {cm}^{3}$

2nd question

length of cuboid :- 7 cm

breadth of cuboid :- 4 cm

height of cuboid :- 3.4 cm

volume = L × B × H

7 × 4 × 3.4

$95.2 {cm}^{3}$

height is increased by 2.6 cm

new height :- 3.4 + 2.6 cm = 6 cm

new volume :- L × B × H

7 × 4 × 6

$168 {cm}^{3}$

3rd question

side of small cube = 2 cm

volume of small cube = side × side × side

$2 \times 2 \times 2 \: {cm}^{3}$

side of large cube = 4 cm

volume of large cube =

${side }^{3} = 4 \times 4 \times 4 \: {cm}^{3}$

small cubes that can be fit in large cube

$\frac{4 \times 4 \times 4}{2 \times 2 \times 2 } = 2 \times 2 \times 2 = 8 \: cubes$