ISEE Upper Level Quantitative : ISEE Upper Level (grades 9-12) Quantitative Reasoning

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

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Example Questions

Example Question #41 : Equations

The distance between Vandalia and Clark is 250 miles and is represented by six inches on a map. The distance between Vandalia and Ferrell is 125 miles.

Which is the greater quantity?

(a) The distance between Clark and Ferrell on a map

(b) Two inches

Possible Answers:

(a) is greater.

(a) and (b) are equal.

(b) is greater.

It is impossible to tell from the information given.

Correct answer:

(a) is greater.

Explanation:

The actual distance between Clark and Ferrell is unknown, but it is at least  miles. If  is the map distance between Clark and Ferrell, then its minimum can be calculated using a proportion:

At the very least, the two are three inches apart on the map, so (a) is greater regardless.

Example Question #45 : How To Find The Solution To An Equation

Carl starts working for a bicycle store today. He wants to buy a certain bicycle, but his  employee discount doesn't take effect until ninety days from now. He finds out that the price of the bicycle is due to increase by  in sixty days. 

Which is the greater quantity? 

(a) The price Carl would pay for the bicycle today

(b) The price Carl would pay for the bicycle in ninety days, assuming that the bicycle does not change in price again

Possible Answers:

(a) is greater.

(b) is greater.

It is impossible to tell from the information given.

(a) and (b) are equal.

Correct answer:

(b) is greater.

Explanation:

(a) Let  be the current price of the bicycle. Without the discount and the markup, Carl would pay  today.

(b) Now we examine what Carl would pay in ninety days. The increase would be  of , or, equivalently, , and the price of the bicycle is

.

The employee discount will be  of this, or , and the price Carl would pay is 

.

Carl would pay more by waiting ninety days.

 

Example Question #42 : Equations

The distance between Vandalia and Clark is 250 miles and is represented by six inches on a map. The distance between Vandalia and Ferrell is 125 miles.

Which is the greater quantity?

(a) The distance between Clark and Ferrell on a map

(b) Ten inches

Possible Answers:

It is impossible to tell from the information given.

(b) is greater.

(a) is greater.

(a) and (b) are equal.

Correct answer:

(b) is greater.

Explanation:

The actual distance between Clark and Ferrell is unknown, but at most it is  miles. If  is the map distance between Clark and Ferrell, then its maximum can be calculated using a proportion:

At the very most, the two are nine inches apart on the map, so (b) is greater regardless.

Example Question #43 : Equations

Which is the greater quantity?

(a) 

(b) 

Possible Answers:

(a) and (b) are equal.

(a) is greater.

(b) is greater.

It is impossible to tell from the information given.

Correct answer:

(a) and (b) are equal.

Explanation:

Substitute to evaluate each expression:

(a) 

(b) 

Example Question #48 : How To Find The Solution To An Equation

A set of tires costs  after a  discount.

Which is the greater quantity? 

(a) The price of the tires before the discount

(b) 

Possible Answers:

(a) is greater.

It is impossible to tell from the information given.

(b) is greater.

(a) and (b) are equal.

Correct answer:

(a) is greater.

Explanation:

discount means that the tires sell for  of their original price. If that original price is , then after the discount, they will sell for  of . This is 

,

which is less than . Therefore, the original purchase price must be greater than .

Example Question #49 : How To Find The Solution To An Equation

Define .

Which is the greater quantity? 

(a) 

(b) 

Possible Answers:

(a) is greater.

(b) is greater.

(a) and (b) are equal.

It is impossible to tell from the information given.

Correct answer:

(a) is greater.

Explanation:

(a) 

First, evaluate :

,

so  .

Now, evaluate :

so .

 

(b) 

 First, evaluate :

,

so .

Now evaluate 

,

so .

 

Example Question #51 : Algebraic Concepts

Define 

Which is the greater quantity?

(a) 

(b) 

 

Possible Answers:

It is impossible to tell from the information given

(b) is greater

(a) and (b) are equal

(a) is greater

Correct answer:

(a) and (b) are equal

Explanation:

(a) To evaluate , use the definition for nonnegative values of :

 

(b) To evaluate , use the definition for negative values of :

 

Example Question #52 : Algebraic Concepts

To convert Fahrenheit temperature  to the equivalent in Celsius , use the formula 

.

Which is the greater quantity?

(a) 

(b) 

Possible Answers:

It is impossible to tell from the information given

(b) is greater

(a) is greater

(a) and (b) are equal

Correct answer:

(a) and (b) are equal

Explanation:

Convert  to Celsius by substituting :

 and  are the same temperature.

Example Question #53 : Algebraic Concepts

Define 

 is positive. Which is the greater quantity?

(a) 

(b) 

Possible Answers:

(a) and (b) are equal

(a) is greater

(b) is greater

It is impossible to tell from the information given

Correct answer:

It is impossible to tell from the information given

Explanation:

Substitute  for  in the definition of :

The relationship of this expression to 0 is uncertain for positive , as we see with these two cases:

 

Example Question #54 : Algebraic Concepts

Carl, the barista at Moose Jaw Coffee, has to mix together two kinds of coffee beans - Vanilla Heaven, which costs $10 a pound, and Mountain Goodness, which costs $15 a pound - to produce a coffee that costs $12 a pound. The beans in the mixture sell for the same price as they would separately.

Which is the greater quantity? 

(a) The number of pounds of Vanilla Heaven beans he will use

(b) The number of pounds of Mountain Goodness beans he will use.

Possible Answers:

It is impossible to tell from the information given

(a) is greater

(b) is greater

(a) and (b) are equal

Correct answer:

(a) is greater

Explanation:

Let and  be, respectively, the number of pounds of Vanilla Heaven and Mountain Goodness beans he will use. Then the cost of the Vanilla Heaven beans will be $10 a pound times the number of pounds, or ; similarly, the cost of the Mountain Goodness beans will be . There will be  pounds of beans total selling for $12 a pound, so the total cost will be . Therefore, we have the equation:

We can solve for :

Two-thirds as much Mountain Goodness coffee goes into the mix as Vanilla Heaven.

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