Question

7. The Sunday crossword puzzle has a total of 225 squares; 60 squares are black and
the rest are white. Each square has an area of 2.5 sq cm. Find the area covered by
(a) all the black squares.
(b) all the white squares.
(c) the complete crossword puzzle.​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Area of black squares = 150 sq. cm.

Area of white squares = 312.5 sq. cm.

Area of the complete crossword puzzle = 462.5 sq. cm.

• The fundamental concept of repeatedly adding the same number is represented by the process of multiplication. The results of multiplying two or more numbers are known as the product of those numbers, and the factors that are multiplied are referred to as the factors.
• Repeated addition of the same number is made easier by multiplying the numbers.
• One-digit numbers can be multiplied simply by using the multiplication tables for solving multiplication problems, however for bigger numbers, we divide the numbers into columns according to their corresponding place values, such as ones, tens, hundreds, thousands, and so on.

Here, according to the given information, we are given that,

Each square has an area of 2.5 sq cm.

Now, we have,

There are 60 black squares.

Then, area of 60 black squares = $60.(2.5) = 150$ sq. cm.

Number of white squares = $225-60 = 165.$

Then, area of 165 white squares = $125.(2.5) = 312.5$ sq. cm.

Then, total area of the complete crossword puzzle = 150 + 312.5 = 462.5 sq. cm.

Hence, the areas are,

• Area of black squares = 150 sq. cm.
• Area of white squares = 312.5 sq. cm.
• Area of the complete crossword puzzle = 462.5 sq. cm.

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