(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - HCF & LCM

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - HCF & LCM

1. If a and b are distinct primes, the LCM of ax and by were x and y are positive integers is

(a) (ab) LCM of x and y
(b) (ab)^xy
(c) a^x/b^y HCF of (x, y)
(d) a^x/ b^y

2. The HCF of 168, 189 and 231 reduced by 8, gives

(a) 13
(b) 14
(c) 17
(d) 21

3. The GCD and LCM of two numbers are 66 and 384 respectively. If the first number is divided by 2, the resulting answer is 66. The second number is

(a) 192
(b) 196
(c) 384
(d) 576

4. The LCM and GCD of two numbers are 240 and 16 respectively. If the two numbers are in the ratio 3 : 5, the numbers are

(a) 24,40
(b) 21,35
(c) 36,60
(d) 48,80

5. The LCM of two numbers is 280 and the ratio of the numbers of 7 : 8. Find the numbers.

(a) 70 and 48
(b) 42 and 48
(c) 35 and 40
(d) 28 and 32

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