Question

11. If the thickness of a pile of 12 cardboard sheets is
35 mm, then the thickness of a pile of 240 sheets is
O
70 cm
O
80 cm
O
90 cm
O 100 cm​

Answer 1

• Option (1) 70 cm is correct.

Given :–

• The thickness of a pile of 12 cardboard sheets = 35 mm.

To Find :–

• The thickness of a pike of 240 sheets.

Solution :–

First, we need to find the value of the thickness of a pile of a cardboard sheet.

So,

Given that,

The thickness of a pile of 12 cardboard sheets = 35 mm.

So,

The thickness of a pile of a cardboard sheet = $\rightarrow \sf \dfrac{35}{12} \: mm$

Hence,

The thickness of a pile of a cardboard sheet is $\rightarrow \sf \dfrac{35}{12} \: mm$

Now, we have to find the thickness of 240 cardboard sheets = $\sf \dfrac{35}{\cancel{12}} \times \cancel{240} \: mm$

$\rightarrow \sf \dfrac{35}{\cancel6} \times \cancel{120} \: mm$

$\rightarrow \sf \dfrac{35}{\cancel3} \times \cancel{60} \: mm$

$\rightarrow \sf \dfrac{35}{1} \times {20}\: mm$

$\rightarrow \sf {35} \times {20} \: mm$

$\rightarrow \sf 700 \: mm$

Now, we have to convert mm to cm.

We know that,

• 10 mm = 1 cm

So,

For converting, we need to divide length value by 10.

We have,

• 700 mm.

Now,

$\rightarrow \dfrac{70 \cancel0}{1 \cancel0} \: cm$

$\rightarrow70 \: cm$

Hence,

The option (1) 70 cm is correct.