Colby wants to set square tiles on the top of a wooden box. the top of the box is a rectangle7 1/2 inches long and 5 1/2 inches wide.
how many 1/2 -inch square tiles would colby need to cover the top of the box?

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percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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