All ISEE Upper Level Math Resources
Example Questions
Example Question #21 : Equations
Consider the following system: and . What is the sum of and ?
9
1
3
-1
-2
1
We first need to line up the equations and solve for . If we add the equations together we get:
+
_______________
From this, we have . Now we plug into either equation to find that . Thus, .
Example Question #21 : Equations
;
Find the value of .
When plugging in the values for and , we find that the answer is :
Example Question #31 : How To Work With Percentages
A class has 25 students. If 60% of them are boys, how many students are girls?
10
9
15
8
20
10
We know that 40% of the class are girls because 60% are boys. To express 40% as a fraction of the 25 total students, we set up a proportion to find the number of girls in the class.
When solving for , we find that there are 10 girls in the class.
Example Question #2 : How To Do Work Problems
Machine A can produce 4 books in 2 days. Machine B can produce 20 books in 4 days. How many books can machines A and B, working together, produce in 40 days?
280
120
200
960
10
280
Through simplification, we can see that machine A produces 2 books a day and that machine B produces 5 books a day. If we multily each by 40 days and add them together, we find that together they can produce 280 books in 40 days:
Example Question #1 : How To Add And Subtract Fractions
Adam has 3 siblings. When his mother bakes a cake, each of the 4 children is given ¼ of the cake. Adam only finished 1/3 of his share of cake. If the original cake had 12 slices, how many slices did Adam eat?
1
2
4
3
6
1
Each of the children gets 1/4 of the cake. Taking 1/4 of 12 shows that each child gets 3 slices. If Adam finishes 1/3 of his share, then he has eaten one out of the 3 slices.
Example Question #21 : Algebraic Concepts
Solve for :
7
21
18
42
63
63
We first add 14 to both sides to get by itself. This leaves us with . Divide both sides by to see that the answer is
Example Question #22 : Algebraic Concepts
Solve for :
69
23
15
5
7
69
Subtract 22 from both sides, then multiply by 3 to solve for :
Example Question #23 : Algebraic Concepts
What percent of 60 is 45?
75%
80%
25%
50%
45%
75%
We need to set up a proportion to find out what percent of 60 is 45. When solving the proportion, we find that the answer is 75%.
Example Question #28 : Algebraic Concepts
Solve the set of equations
Solve the second equation for y:
Substitute into the first equation:
Substitute into the first equation:
Solve for y:
Example Question #29 : Algebraic Concepts
Solve for .