# The width of the rectangle is a dm, which is 40% of its length. What is the area of this rectangle?

July 26, 2021 | education

| The first step is to represent the percentages as a fraction. To do this, divide the number of percent by one hundred.

40% = 40/100 = 0.4.

Let’s calculate what the length is, knowing that 0.4 of it is a decimetres. To do this, we must divide the number a by 0.4.

a / 0.4 cm.

Let’s calculate what the area of the rectangle is. To do this, multiply the length by the width.

S = a / 0.4 * a = a² / 0.4 cm².

Answer: a² / 0.4 cm².

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.