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?
48
30
42
36
Correct Answer : D
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.
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Correct Answer is A
Explanation
We determine least common denominator (LCD) using prime factorization of denominators as follows
2=1*2
3=1*3
5=1*5
Thus, LCD of 2, 3, 5 = 2*3*5=30
Correct Answer is C
Explanation
In direct proportion relation, we utilize the relationship as:
Variable∝Variable 2
Thus from the given case,
Force∝stretch
We introduce a constant term, K to remove the sign of proportionality as
Force=K* stretch
Let’s find the value of K, using Force=132 N and stretch of 0.07 m
132 N=K*0.07 m
K=132 N/0.07 m=1885.7 N/m
Now substitute this value of K in the following equation
Force=1885.7 N/m * stretch
For a stretch of 0.1 m, the force needed is
Force=1885.7 N/m * 0.1 m=188.57 N=188.6 N
Correct Answer is A
Explanation
Let two numbers be x and y. Then
Three time a number=3x
Eight times a different number = 8y
Sum of the two is 3x+8y
Correct Answer is C
Explanation
A negative correlation means as one variable increases, the other variable decreases or as one variable decreases, the other variable increases. Based on this definition, we analyze the given statement as follows:
People who play baseball more tend to have more hits is POSITIVE CORRELATION
Shorter people tend to weigh less than taller people is a POSITIVE CORRELATION
Tennis balls that are older tend to have less bounce is a NEGATIVE CORRELATION
Cars that are older tend to have higher mileage is a POSITIVE CORRELATION
Correct Answer is A
Explanation
Given the equation (x/y)-z=rw, we make x the subject of the formula as follows:
(x/y)-z=rw
Add z to both sides of the equation
(x/y)-z+z=rw+z
(x/y)=rw+z
Multiply both sides by y
(x/y)*y=y(rw+z)
X=y(rw+z)
Rearranging the equation results in:
X = y(z+rw)
Correct Answer is C
Explanation
To find the area of the largest circle that fits in the rectangle, we need to determine the area of a circle with a diameter of 8 cm or less to fit on the rectangle with the given measurements as illustrated below.
Area of circle= πr2
Radius of circle, r=8cm/2=4cm
Then, area of the largest circle is:
Area of circle= π*4 cm *4 cm =16π cm2
Correct Answer is A
Explanation
Step 1: Find a common denominator
The least common denominator (LCD) of 6 and 3 is 6.
Convert 4/3​ to have denominator 6:
4/3=8/6
Step 2: Add the fractions
5/6+8/6=13/6​
Step 3: Convert to a mixed number
13/6 = 2 1/6
The best estimate is about 2 ½ cups.
Correct Answer is C
Explanation
From the given equation, the variable t is varied to obtain the value of f(t). This means that t is an independent variable, modified variable while f(t) is a dependent variable, a measured value.
Correct Answer is B
Explanation
We use the relation 1 kg=1000 g to convert 3.193 kg to g
Correct Answer is D
Explanation
To compare the given values, convert them to the same number format. In this case, convert the given fractions into equivalent decimals.
10/3=3.3333…..
9/2=4.5
Thus, the numbers become 4.25, 3.333…, 4.4, 4.5
Now arranging them in ascending order becomes 3.333…., 4.25, 4.4, 4.5
From the above, 4.5 is the greatest value.
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