Question

Heya! Answer the following MCQ!

A typist uses a sheet measuring 20 cm by 30 cm lengthwise. If a margin of 2 cm is left on each side and a 3 cm margin on top and bottom, the percent of the page is used is :
a. 40
b. 60
c. 64
d. 72

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Answer 1

Answer:

option c) 64%

Step-by-step explanation:

Given :

A typist uses a sheet measuring 20 cm by 30 cm lengthwise.

A margin of 2 cm is left on each side and a 3 cm margin on top and bottom.

To find :

the percent of paper used

Solution :

The length of the sheet = 20 cm

The breadth of the sheet = 30 cm

Area of the sheet = length of sheet × breadth of sheet

Area of the sheet = 20 cm × 30 cm

Area of the sheet = 600 cm²

A margin of 2 cm is left on each side.

Length of the sheet used for typing = 20 – (2+2) = 20 – 4 = 16 cm

A 3 cm margin is left on top and bottom.

Breadth of the sheet used for typing = 30 – (3+3) = 30 – 6 = 24 cm

Area of the sheet used for typing = 16 cm × 24 cm

= 384 cm²

The percentage of the paper used = (area of the sheet used for typing/area of the sheet) × 100

= 384/600 × 100

= 384/6

= 64 %

Answer 2

$\sf\small\blue{Given:}$

$\sf\rightarrow \: A \: typist \: \: uses \: a \: sheet \: measuring \: 20 cm \: 30 cm \: length \: wise.$

$\sf\rightarrow \: margin \: of \: 2 cm \: is \: left \: on \: each side \: and \: a \: 3 cm \: margin \: on \: top \: and \: bottom.$

$\sf\small\blue{Find : }$

$\sf\rightarrow \: Find \: the \: percent \: of \: page \: used \: \: for \: typing .</p><p></p><p></p><p>$

$\sf\small\blue{Solution : }$

Length of sheet = 20 cm

Breadth of sheet = 30 cm

Area of sheet = length breadth = 600

A margin of 2 cm is kept on left side and right side

So, length of area of typing = 20 -(2+2) = 16 cm

A 3 cm margin on top and bottom

So, width of area of typing = 30-(3+3) = 24 cm

So, area of typing = 16 + 24 = 384

So, The percent of the page is used for typing=

$\leadsto \sf \frac{384}{600} \times 100$

✈︎✈︎Hence 64% of the page is used for typing.