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Structure in Expressions 1
Problem 1:
Each student in the classroom has at least 3 pencils. There are b boys and 9 girls in the classroom and b > 9.
If p represents the total number of pencils in the room, is this statement true?
p >= 3(b+9)
This statement says the total number of pencils is greater than or equal to 3 times the number of boys and girls.
Solution:
Assign unknown variables values
b > 9
= 9 < b
= 10
Each student has at least 3 pencils
Therefore the number of pencils must be greater than 0
Therefore the total pencils of boys must be greater than or equal to 30 because 10 times 3 is 30
Therefore the total pencils of girls must be greater than or equal to 27 always
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