13
Q:

Of the following, which is greater than ½ ?

Indicate ALL such fractions.

A) 2/5 B) 4/7
C) 4/9 D) 5/11

Answer:   B) 4/7



Explanation:

One way to deal with fractions is to convert them all to decimals. 

In this case all you would need to do is to see which is greater than 0.5.

Otherwise to see which is greater than ½, double the numerator and see if the result is greater than the denominator. In B doubling the numerator gives us 8, which is bigger than 7. 

Subject: Average
Exam Prep: GRE
Q:

There are a total of 200 students in a school, of which 7/10th are boys. Find the number of girls in the school.

A) 80 B) 60
C) 40 D) 120
 
Answer & Explanation Answer: B) 60

Explanation:
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1 1038
Q:

A group of boys has an average weight of 36 kg. One boy weighing 42 kg leaves the group and another boy weighing 30 kg joins the group. If the average now becomes 35.7 kg, then how many boys are there in the group?

A) 30 B) 32
C) 40 D) 56
 
Answer & Explanation Answer: C) 40

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0 1172
Q:

The average marks in science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?

A) 68.5 B) 69
C) 69.5 D) 70
 
Answer & Explanation Answer: B) 69

Explanation:

Difference of marks = 72 + 61 –48 –65 = 20∴Correct average marks = 68 +20/20= 69

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0 1141
Q:

What is the average of first 93 natural numbers?

A) 45 B) 46
C) 47 D) 49
 
Answer & Explanation Answer: C) 47

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1 1932
Q:

The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?

A) 10 B) 11
C) 12 D) 13
 
Answer & Explanation Answer: C) 12

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1 1075
Q:

The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is :

A) 49/7 B) 19/7
C) 50/7 D) 18/7
 
Answer & Explanation Answer: D) 18/7

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6 1203
Q:

The average temperature for Monday, Tuesday, Wednesday and Thursday was 48° . The average temperature for Tuesday, Wednesday, Thursday and Friday was 52°, If the temperature on Monday was 42°, then the temperature on Friday was (in degrees)

A) 58 B) 56
C) 52 D) 50
 
Answer & Explanation Answer: A) 58

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0 980
Q:

Due to a price hike of 20% , 4 kg less sugar is available for Rs. 120 . What is the initial price per kg of sugar ?

A) Rs. 5 Kg B) Rs. 4 Kg
C) Rs. 6 Kg D) Rs. 5.5 Kg
 
Answer & Explanation Answer: A) Rs. 5 Kg

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3 2121