EDGE Math 8

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Result

Choose the correct answer to each question.

1.	If x represents the number of cows and y, the number of hens on a farm, what expression will give the total number of legs of the animals?

4 x + 2 y

x + y

2 x + 4 y

\frac{x}{4} + \frac{y}{2}

Answer: $4 x + 2 y$

2.	Let x be the number of boys and y, the number of girls in a camp. The number of girls exceeds twice the number of boys by 12. Which equation represents the relation between the number of girls and the number of boys?

x = 2 y + 12

y = 12 - 2 x

x = 12 + 2 x

y = 2 (12 - x)

Answer: $x = 12 + 2 x$

3.	A number y is at most 50. Which inequality can represent such statement?

y < 50

y \leq 50

y > 50

y \geq 50

Answer: $y \leq 50$

4.	The sum of two numbers x and y is at least 15. Which of the following can represent such statement?

x + y = 15

x + y < 15

x + y \leq 15

x + y \geq 15

Answer: $x + y \geq 15$

5.	The difference between the numbers x and y is greater than 20. Which inequality can represent such statement?

x - y \geq 20

x - y < 20

x - y > 20

x - y \leq 20

Answer: $x - y > 20$

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