ISEE Middle Level Math : Algebraic Concepts

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

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Example Questions

Example Question #231 : Algebraic Concepts

Solve for \(\displaystyle x\):

\(\displaystyle 5x - 15 = x + 84\)

Possible Answers:

\(\displaystyle x = 24\frac{3}{4}\)

\(\displaystyle x= 13\frac{4}{5}\) 

\(\displaystyle x = 17\frac{1}{4}\)

\(\displaystyle x=16\frac{1}{2}\)

\(\displaystyle x=11\frac{1}{2}\)

Correct answer:

\(\displaystyle x = 24\frac{3}{4}\)

Explanation:

\(\displaystyle 5x - 15 = x + 84\)

\(\displaystyle 5x -x- 15 = x-x + 84\)

\(\displaystyle 4x- 15 = 84\)

\(\displaystyle 4x-15+ 15 = 84+15\)

\(\displaystyle 4x = 99\)

\(\displaystyle 4x \div 4= 99\div 4\)

\(\displaystyle x = 24\frac{3}{4}\)

Example Question #231 : Algebraic Concepts

Nathan is riding his bike to baseball practice. If he needs to travel 12 miles, how long will it take him to get there if he pedals at a rate of 5 miles per hour?

Possible Answers:

\(\displaystyle 2\ hours\ 24\ minutes\)

\(\displaystyle 1\ hour\)

\(\displaystyle 4\ hours\)

\(\displaystyle 2\ hours\)

Correct answer:

\(\displaystyle 2\ hours\ 24\ minutes\)

Explanation:

Divide:

\(\displaystyle 12\div 5=2.4\)

Answer: It will take Nathan at least 2 hours, plus an additional \(\displaystyle 0.4\times 60=24\ minutes\).

So it will take him 2 hours and 24 minutes.

Example Question #232 : Algebraic Concepts

\(\displaystyle 3a+4=34\)

What is a?

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 10\)

\(\displaystyle 34\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 10\)

Explanation:

First, subtract:

\(\displaystyle 3a+4-4=34-4\)

\(\displaystyle 3a=30\)

Then divide each side by 3:

\(\displaystyle \frac{3a}{3}=\frac{30}{3}\)

\(\displaystyle a=10\)

Answer: 10

Example Question #233 : Algebraic Concepts

\(\displaystyle 9b+6=24\)

What is b?

Possible Answers:

\(\displaystyle 30\)

\(\displaystyle 6\)

\(\displaystyle 2\)

\(\displaystyle 9\)

\(\displaystyle 18\)

Correct answer:

\(\displaystyle 2\)

Explanation:

First, subtract 6 from each side:

\(\displaystyle 9b+6-6=24-6\)

\(\displaystyle 9b=18\)

Then, divide each side by 9:

\(\displaystyle \frac{9b}{9}=\frac{18}{9}\)

\(\displaystyle b=2\)

Answer: 2

Example Question #234 : Algebraic Concepts

\(\displaystyle 4b+7=55\)

What is b?

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 6\)

\(\displaystyle 8\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 12\)

Explanation:

First, subtract 7 from each side:

\(\displaystyle 4b+7-7=55-7\)

\(\displaystyle 4b=48\)

Then, divide each side by 4:

\(\displaystyle \frac{4b}{4}=\frac{48}{4}\)

\(\displaystyle b=12\)

Answer: 12

Example Question #235 : Algebraic Concepts

\(\displaystyle 7x+6=48\)

What is \(\displaystyle x\)?

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 8\)

\(\displaystyle 5\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 6\)

Explanation:

First subtract 6 from both sides:

\(\displaystyle 7x+6-6=48-6\)

The, divide by 7 on each side:

\(\displaystyle \frac{7x}{7}=\frac{42}{7}\)

\(\displaystyle x=6\)

Answer: 6

Example Question #1145 : Concepts

\(\displaystyle 16a-3=29\)

Solve for \(\displaystyle a.\)

Possible Answers:

\(\displaystyle 48\)

\(\displaystyle 3\)

\(\displaystyle 2\)

\(\displaystyle 16\)

\(\displaystyle 32\)

Correct answer:

\(\displaystyle 2\)

Explanation:

First, add 3 on both sides:

\(\displaystyle 16a-3+3=29+3\)

Then, divide by 16 on both sides:

\(\displaystyle \frac{16a}{16}=\frac{32}{16}\)

\(\displaystyle a=2\)

 

Example Question #236 : Algebraic Concepts

Henry walked five miles on Tuesday and five miles on Wednesday. On Thursday, he walked 8 miles. How many miles did Henry walk all together?

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 10\)

\(\displaystyle 13\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 18\)

Explanation:

Add up all of the miles that Henry walked:

\(\displaystyle 5+5+8=18\)

Answer: Henry walked 18 miles.

Example Question #2354 : Isee Middle Level (Grades 7 8) Mathematics Achievement

\(\displaystyle 9a+2=83\)

What is \(\displaystyle a\)?

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 2\)

\(\displaystyle 81\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 9\)

Explanation:

First, subtract 2 from each side:

\(\displaystyle 9a+2-2=83-2\)

\(\displaystyle 9a=81\)

Then, divide each side by 9:

\(\displaystyle \frac{9a}9}=\frac{81}{9}\)

\(\displaystyle a=9\)

 

Example Question #2355 : Isee Middle Level (Grades 7 8) Mathematics Achievement

\(\displaystyle 6b+14=50\)

What is \(\displaystyle b\)?

Possible Answers:

\(\displaystyle 36\)

\(\displaystyle 6\)

\(\displaystyle 14\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 6\)

Explanation:

First, subtract 14 from each side:

\(\displaystyle 6b+14-14=50-14\)

\(\displaystyle 6b=36\)

Then, divide each side by 6:

\(\displaystyle \frac{6b}{6}=\frac{36}{6}\)

\(\displaystyle b=6\)

 

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