A gumball machine contains red, orange, yellow, green, and blue gumballs. Twenty percent of the gumballs are red, 30% are orange, 5% are yellow, 10% are green, and the rest are blue. If there are a total of 120 gumballs, how many more blue gumballs are there than yellow gumballs?
A. 48
B. 30
C. 42
D. 36
Determine the number of blue and yellow gumballs as follows:
Percent of blue gumballs=100%-(20%+30%+5%+10%) =100%-65%=35%
Number of blue gumballs35% of 120=0.55*120 = 42 blue gumballs [35%=35/100=0.35]
Number of yellow gumballs=5% of 120=0.05*120 = 6 yellow gumballs [5%=5/100=0.05]
Difference between the number of blue and yellow gumballs=42-6= 36 balls
Therefore, there are 36 more blue gumballs than yellow gumballs.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Math
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Q #1: Which of the following measurements is the approximate metric equivalent of 7 inches?
A. 3.2 cm
B. 2.8 cm
C. 15.4 cm
D. 17.8 cm
Answer Explanation
Use the relation 1 inch=2.54 cm to change 7 inches to cm
Thus, 7 inches is about 17.8 cm.
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Q #2: Elevation above sea level and temperature are negatively-correlated variables. Which of the following statement describes the relationship between the variables?
A. As elevation decreases, temperature remains the same
B. As elevation decreases, temperature decreases
C. As elevation increases, temperature decreases
D. As elevation increases, temperature increases
Answer Explanation
In a negatively-correlated variables, a change in one variable result in opposite change in the other variable. In other words, an increase in on variable results in a decrease in the other.
Now let’s analyze the given scenarios:
As elevation decreases, temperature remains the same this is NO-CORRELATION
As elevation decreases, temperature decreases is a POSITIVE CORRELATION
As elevation increases, temperature decreases is a NEGATIVE CORRELATION
As elevation increases, temperature increases is a POSITIVE CORRELATION
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Q #3: A leather recliner is on sale for 30% less than its original price. A consumer has a coupon that saves an additional of 25% off of the sale price. If the consumer pays $237 for the recliner, which of the following is the original price of the recliner to the nearest dollar?
A. $316
B. $431
C. $451
D. $527
Answer Explanation
Total percent discount is 30%+25%=55%
So, the percentage of client pays for the recliner is 100%-55%=45%.
The 45% is what represents $237 and the original price is 100%, which is determined as follows:
The original price of the recliner is $526.60 which is approximately $527.
