ISEE Middle Level Quantitative : How to find the solution to an equation

Study concepts, example questions & explanations for ISEE Middle Level Quantitative

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Example Questions

Example Question #152 : Isee Middle Level (Grades 7 8) Quantitative Reasoning

Evaluate .

Possible Answers:

It is impossible to evaluate  from the information given

Correct answer:

Explanation:

We will not be able to solve for the values of and ; instead, we need to group them together by reorganizing the equation.

Start by adding and subtracting on each side. This will allow both variables to be on the left and both whole numbers to be on the right.

can be factored out of the left side.

Divide both sides by .

Example Question #31 : How To Find The Solution To An Equation

Divide 1,000 by 30. The quotient is ; the remainder is . Which is the greater quantity?

(A) 

(B) 

Possible Answers:

(B) is greater

(A) and (B) are equal

(A) is greater

It is impossible to tell which is greater from the information given

Correct answer:

(A) is greater

Explanation:

First, divide:

 and , so .

(A) is greater.

Example Question #32 : How To Find The Solution To An Equation

Evaluate .

Possible Answers:

It is impossible to evaluate  from the information given

Correct answer:

It is impossible to evaluate  from the information given

Explanation:

We cannot solve for and on their own. Instead, we need to reorganize the equation to find .

It quickly becomes clear that we cannot solve for with certainty.

 

If  and , then 

, since

This makes 

 

If  and , then 

, since

This makes 

 

Therefore,  cannot be evaluated with certainty.

Example Question #32 : How To Find The Solution To An Equation

Divide 200 by 17. The quotient is ; the remainder is . Which is the greater quantity?

(A) 

(B) 

Possible Answers:

It is impossible to tell which is greater from the information given

(A) is greater

(B) is greater

(A) and (B) are equal

Correct answer:

(B) is greater

Explanation:

 and .

 and (B) the greater quantity.

Example Question #161 : Algebraic Concepts

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

One 

Zero

It cannot be determined from the information given

Infinitely many

Two

Correct answer:

Zero

Explanation:

If , the equation can be restated and solved as follows:

However, no integer can be squared to yield a negative result; therefore, there is no solution, and the correct response is "zero."

Example Question #33 : How To Find The Solution To An Equation

How many elements of the set  can be substituted for  to make the inequality  a true statement?

Possible Answers:

One 

Three

None

Four

Two

Correct answer:

Three

Explanation:

Three elements of the set—1, 2, and 3—fit this criterion.

Example Question #31 : Equations

Which is greater?

(A) 

(B) 

Possible Answers:

(A) and (B) are equal

It is impossible to determine which is greater from the information given

(B) is greater

(A) is greater

Correct answer:

(B) is greater

Explanation:

 

, so .

Therefore , so (B) is greater.

Example Question #34 : How To Find The Solution To An Equation

How many elements of the set  can be substituted for  to make the inequality  a true statement?

Possible Answers:

Four

Five 

Two

One

None

Correct answer:

None

Explanation:

 (Note that the inequality symbol switches here.)

 

None of the elements of  fit this criterion.

Example Question #31 : Equations

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

Infinitely many

Two

Three

One

Zero

Correct answer:

One

Explanation:

If , then the equation can be rewritten and solved as follows:

The only integer that can be substituted for  to make this true is , so the correct response is "one".

Example Question #35 : How To Find The Solution To An Equation

If a and b are complementary angles, what is the value of a if b is equal to 33 degrees?

Possible Answers:

Correct answer:

Explanation:

Complementary angles add up to 90 degrees. Therefore, 

Given that b is equal to 33 degrees, the equation is:

Next, 33 should be subtracted from each side of the equation. 

Therefore, 57 is the correct answer. 

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