GED Math : Proportions and Percentages
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Example Questions
Example Question #41 : Proportions And Percentages
Ten percent of a number is six more than 5 percent of this number. Find the number.
The key word "is" indicates equality.
Ten percent of a number:
Six more than 5 percent of this number:
Solve and simplify:
Example Question #71 : Complex Operations
45% of what number is 9?
The rate is 45% and the comparative number is 9; the unknown is the original number that 9 is 45% of. The statement is "(nine) is (forty-five percent) of (some number)", so the variable stands for a number.
Example Question #41 : Proportions And Percentages
A building that is 
To solve this you would set up and solve a direct proportion:
Example Question #44 : Proportions And Percentages
Bob's Bargain Basement has computer tables on sale at 50% off the retail price. For the holiday, an additional 15% is deducted. If the computer table is $240, how much is the table on sale for during the holiday?
In order to calculate the amount of the purchase, you first must find the cost of the table at 50% off. This can be done by taking 
This could also be done by converting the percent to a decimal and then multiplying that decimal by the original cost.
Then, the next step would be to take 15% of the $120. This is done by converting the percent to a decimal and then multiplying by $120.
15% = .15 as a decimal
This additional savings of $18.00 would then be subtracted from the $120.00.
This is the amount that will be paid after all discounts and savings.
Note: Do not add the initial savings of 50% to the additional savings of 15% to get a total savings of 65% and then work your problem from there. That is not the correct way to work this problem!
Example Question #45 : Proportions And Percentages
Solve:
Cross multiply the terms.
Divide by eight on both sides.
The answer is:
Example Question #46 : Proportions And Percentages
What is 30% of 750?
To find a percentage of a whole number, we will multiply the percentage by the whole number. So, we get
To make things easier, we will simply by cancelling out the zeros. So, we get
Therefore, 30% of 750 is 225.
Example Question #47 : Proportions And Percentages
What is 90% of 750?
To find a percentage of a whole number, we will multiply the percentage by the whole number.
So, we get
To simplify, we can cancel. The zeros will cancel each other out. We get
Therefore, 90% of 750 is 675.
Example Question #48 : Proportions And Percentages
Solve the proportion:
Cross multiply the terms.
Divide by six on both sides.
The answer is:
Example Question #411 : Ged Math
Solve the proportion:
Cross multiply the terms.
Distribute the terms.
Subtract 
Divide or multiply by negative one to isolate the x-variable.
The answer is:
Example Question #50 : Proportions And Percentages
Solve the proportion:
Cross multiply the terms.
Divide by 24 on both sides.
Reduce the fractions.
The answer is:
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