Number System - Quantitative Aptitude Questions with Answers

Answer: Option [D]

The LCM of 18 and 60 is (2*3*3*10) = 180

Answer: Option [A]

The HCF of 18 and 60 is (3*3) = 9

Answer: Option [C]

Let the two numbers be x and (x+1) respectively

So, x(x+1) = 8372

x² + x - 8372 = 0

x² + 92x - 91x -8372 = 0

(x + 92)(x - 91) = 0

x = 91

Hence the two numbers are 92 and 91 and the smaller number is 91

Answer: Option [C]

Let the four consecutive even numbers be (x-2), x, (x+2) and (x+4) respectively.

Then, (x-2)+x+(x+2)+(x+4) = 100

4x + 4 = 100

x = 24

Hence the numbers are 22, 24, 26 and 26

The sum of their squares

= 22² + 24² + 26² + 28²

= 2520

Answer: Option [D]

Let the five consecutive odd numbers be (x-4), (x-2), x, (x+2), (x+4) respectively.

Now, (x-4) + x = 30

x = 17

Therefore the value of E is (17+4) = 21