Algebra Test 3

Question 1:

The ratio of male rat to female rat in a biology laboratory is 4:3. If the biology Lab has 63 rat, what is the difference between the number of male rat and the number of female rat?

A: 7

B: 9

C: 11

D: 13

E: 15

Question 2:

A: x = 3 and y = -5/2

B: x = 3 and y = 5/2

C: x = -3 and y = -5/2

D: x = -3 and y = -5

E: x = 3 and y = -5

Question 3:

The difference between twice the first number and second number is five. The sum of first number and three times second number is 6, find the two numbers.

A: x = 5 and y = 5

B: x = 9 and y = 13

C: x = 2 and y = -1

D: x = 3 and y = 1

E: x = 6 and y = 7

Question 4:

How many gallon of water need to mix with 25 gallon of salt water that has 16% of salt to get a mixture that is 10% salt water?

A: 35

B: 30

C: 25

D: 20

E: 15

Question 5:

The area of a rectangular is 180 square feet. If the perimeter is 54 feet, what is the dimensions of the rectanglar?

A: 20 by 90

B: 10 by 18

C: 12 by 15

D: 30 by 6

E: 45 by 4