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:
B:
C:
D:
E:
Question 2:
A:
B:
C:
D:
E:
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:
B:
C:
D:
E:
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:
B:
C:
D:
E:
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:
B:
C:
D:
E: