5
Q:

Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is :

A) 83 B) 89
C) 85 D) 79

Answer:   C) 85



Explanation:

Since the numbers are co-prime, they contain only 1 as the common factor.
Also, the given two products have the middle number in common.
So, middle number = H.C.F of 551 and 1073 = 29;
First number = 551/29 = 19
Third number = 1073/29 = 37.
Required sum = 19 + 29 + 37 = 85.

Subject: Problems on Numbers
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Q:

10 Consecutive numbers are given. If the average of the two numbers given in the middle is 13.5, then what is the sum of the first 6 numbers?

A) 65 B)  59
C) 69 D) 80
 
Answer & Explanation Answer: C) 69

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Q:

1.1 + 12.12 + 123.123 = ?

A) 134.343 B) 133.433
C) 132.123 D) 136.343
 
Answer & Explanation Answer: D) 136.343

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Q:

Which of the following is in ascending order?

A) 2/3, 3/4, 4/5, 1/2 B) 3/4, 4/5, 1/2, 2/3
C) 1/2, 2/3, 3/4, 4/5 D) 4/5, 1/2, 2/3, 3/4
 
Answer & Explanation Answer: C) 1/2, 2/3, 3/4, 4/5

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0 265
Q:

Find the least number to be added to 1739 so that it is exactly divisible by 11.

A) 11 B) 2
C) 1 D) 10
 
Answer & Explanation Answer: D) 10

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Q:

Which instrument is used for viewing the sun?

A) Stroboscope B) Telescope
C) Helioscope D) Sun meter
 
Answer & Explanation Answer: C) Helioscope

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0 244
Q:

Which of the following is the least of all?

A) 0.5 B) 1/0.5
C) 0.5 * 0.5 D) 0.5 * 2
 
Answer & Explanation Answer: C) 0.5 * 0.5

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Q:

If the sum of digits is 9 and the difference between the digit in the ten's place and unit's place is 1, then the two-digit number is?

A) 45 B) 63
C) 54 D) 72
 
Answer & Explanation Answer: C) 54

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Q:

Which of the following numbers is composite?

 

A) 47 B) 57
C) 37 D) 67
 
Answer & Explanation Answer: A) 47

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