Question

We would need 7 more squares in order to get 80%. Thus, 52% of the grid is shaded.

What is the unitary method?
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.

anwer is a52 b7

Answer 1

The percentage of the grid that is shaded is 52% and the additional number of squares to get 80% shaded grids is 7

The percentage of the grid that is shaded

The complete question is added as an attachment

From the question, we have the following parameters:

• Shaded grids = 13
• Total number of grids = 25

So, the percentage of the grid that is shaded is

Percentage = Shaded grids/Total number of grids

This gives

Percentage = 13/25

Evaluate the quotient

Percentage = 0.52

Express as percentage

Percentage = 52%

Hence, the percentage of the grid that is shaded is 52%

The additional number of squares to get 80% shaded grids

In (a), we have:

Percentage = 13/25

Let the additional number of grids be x.

So, we have:

Percentage = (13 + x)/25

The new percentage is 80%.

So, we have:

(13 + x)/25 = 80%

Multiply both sides by 25

13 + x = 20

Subtract 13 from both sides

x = 7

Hence, the additional number of squares to get 80% shaded grids is 7

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