SSAT Middle Level Math : How to find the solution to an equation

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

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Example Questions

Example Question #1 : Equations

James bought candy using a 10 dollar bill and received \displaystyle y dollars in change.  Which of the following describes how much James paid for the candy?

Possible Answers:

\displaystyle y/10

\displaystyle y-10

\displaystyle 10+y

\displaystyle 10/y

\displaystyle 10-y

Correct answer:

\displaystyle 10-y

Explanation:

The amount of change given after a purchase is the amount the customer pays minus the cost of the item.  So the cost of the item is the amount the customer pays minus the amount of change received.

Example Question #1 : How To Add And Subtract Fractions

For a party, Marco buys 4 boxes of cookies, each containing 10 cookies.  Marco gives each of his guests 3 cookies, and then he eats 6 cookies himself.  He now has 4 cookies left.  How many guests did Marco give cookies to?

Possible Answers:

\displaystyle 10

\displaystyle 7

\displaystyle 12

\displaystyle 11

\displaystyle 8

Correct answer:

\displaystyle 10

Explanation:

He begins with 40 and ends with 4, so 36 cookies total were eaten.  Since he ate 6 himself, that means that his guests ate 30.  Since each guest ate 3 cookies, \displaystyle 30/3 =10 guests.

Example Question #1 : Ssat Middle Level Quantitative (Math)

Jacob, Judy and John add up all of their ages and get a total of 29.  If they do the same thing 2 years from now, what will be their total?

Possible Answers:

\displaystyle 40

\displaystyle 29

\displaystyle 34

\displaystyle 35

\displaystyle 31

Correct answer:

\displaystyle 35

Explanation:

In two years, each person will be 2 years older.  Since there are 3 of them, their ages will be \displaystyle 3\times2 years more, so we add 6 to the original total of 29

Example Question #1 : Algebra

If \displaystyle x\triangleright y = x- y +xy, then \displaystyle 3\triangleright 2 = ?

Possible Answers:

\displaystyle 7

\displaystyle 2

\displaystyle 6

\displaystyle 5

\displaystyle 4

Correct answer:

\displaystyle 7

Explanation:

Plug in 3 where you see \displaystyle x and 2 where you see \displaystyle y to get \displaystyle 3-2+3\times2.  This equals 7.

Example Question #2 : Ssat Middle Level Quantitative (Math)

Solve for \displaystyle x

\displaystyle 5 (x+7) = 80

Possible Answers:

\displaystyle x=11

\displaystyle x=13

\displaystyle x=14

\displaystyle x=9

\displaystyle x=16

Correct answer:

\displaystyle x=9

Explanation:

\displaystyle 5 (x+7) = 80

\displaystyle 5 \cdot x+5 \cdot 7 = 80

\displaystyle 5x+35= 80

\displaystyle 5x+35 -35= 80-35

\displaystyle 5x= 45

\displaystyle 5x \div 5= 45\div 5

\displaystyle x = 9

Example Question #3 : Ssat Middle Level Quantitative (Math)

Solve for \displaystyle n:

\displaystyle 11n -35 = 97

Possible Answers:

\displaystyle n = 11

\displaystyle n = 12

\displaystyle n = 13

\displaystyle n = 9

\displaystyle n = 14

Correct answer:

\displaystyle n = 12

Explanation:

Add 35, then divide by 11:

\displaystyle 11n -35 = 97

\displaystyle 11n -35 +35 = 97 +35

\displaystyle 11n = 132

\displaystyle 11n \div 11= 132\div 11

\displaystyle n = 12

Example Question #4 : How To Find The Solution To An Equation

Solve for \displaystyle n:

\displaystyle 9n - 13 = 59

Possible Answers:

\displaystyle n = 9

\displaystyle n = 5

\displaystyle n = 8

\displaystyle n = 7

\displaystyle n = 6

Correct answer:

\displaystyle n = 8

Explanation:

Add 13, then divide by 9:

\displaystyle 9n - 13 = 59

\displaystyle 9n - 13 +13 = 59+13

\displaystyle 9n = 72

\displaystyle 9n \div 9 = 72 \div 9

\displaystyle n = 8

Example Question #3 : Equations

Solve for \displaystyle n:

\displaystyle 7n - 25 = 52

Possible Answers:

\displaystyle n=12

\displaystyle n=14

\displaystyle n=13

\displaystyle n=11

\displaystyle n=15

Correct answer:

\displaystyle n=11

Explanation:

Add 25, then divide by 7:

\displaystyle 7n - 25 = 52

\displaystyle 7n - 25 +25 = 52+25

\displaystyle 7n = 77

\displaystyle 7n \div 7= 77 \div 7

\displaystyle n=11

Example Question #5 : How To Find The Solution To An Equation

If \displaystyle 13 < M < 17 and \displaystyle M is an even whole number, then \displaystyle M could be

Possible Answers:

\displaystyle 12

\displaystyle 16

\displaystyle 17

\displaystyle 13

\displaystyle 15

Correct answer:

\displaystyle 16

Explanation:

The greater than and less than symbols describe a number that is greater than but not equal to 13 and less than but not equal to 17.  The whole numbers between 13 and 17 are 14, 15, and 16.  The question also qualifies that the number needs to be even so we are looking for 14 or 16. Only 16 is an answer choice available.

Example Question #4 : Ssat Middle Level Quantitative (Math)

If

,

then

Possible Answers:

\displaystyle 6

\displaystyle 4

\displaystyle -8

\displaystyle 9

\displaystyle 10

Correct answer:

\displaystyle 10

Explanation:

So order of operations says to do what's in the parentheses first.  Thus

\displaystyle 9-4=5

\displaystyle 5 \times 3 = 15 

Thus the left side of the equation is 15.  Subtract 5 from both sides to determine what the  is.  

\displaystyle 15 - 5 = 10.  

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