### Most Important Maths Question LCM & HCF for RRB,SSC,RAILWAY,HSSC,BANKING,CLAT,CAT

Previous Years Questions Asked in Railway RRB Exam

 WORK & TIME LCM & HCF CI & SI PROFIT & LOSS STD-SPEED & TIME BOAT & STREAM PIPES & CISTRAN PERCENTAGE NUMBER SYSTEM VBODMAS RATIO AVERAGE

 LCM & HCF SET-1 LCM & HCF SET-2 LCM & HCF SET-3 LCM & HCF SET-4 LCM & HCF SET-5

# LCM & HCF – Set 4

1. What is the HCF of 3/5, 7/10, 2/15, 6/21?
A) 5/123        B) 6/121         C) 2/105        D) 1/210         E) None of these

Answer    D) 1/210

1. The HCF and LCM of two numbers is 84 and 840 respectively. If the first number is 168, find the second one.
A) 210
B) 420
C) 225
D) 326
E) None of these

Answer

1. B) 420
2. Sum of 2 numbers is 128 and their HCF is 8. How many numbers of pairs of numbers will satisfy this condition?
A) 2
B) 5
C) 3
D) 6
E) 4

Answer

1. E) 4
2. Find the least number exactly divisible by 10, 15, 18 and 30.
A) 85
B) 90
C) 88
D) 93
E) 105

Answer & Explanation

1. B) 90
Explanation:

It will be the LCM of these numbers.
2. Find the least number which when divided by15, 21, 24 and 32 leaves the same remainder 2 in each case.
A) 3362
B) 3360
C) 3456
D) 3266
E) 3364

Answer & Explanation

1. A) 3362
Explanation:

It will be the LCM of these numbers + 2
So 3360 + 2
2. Find the least number which when divided by 10, 15, 18 and 30 leaves remainders 6, 11, 14 and 26 respectively.
A) 72
B) 86
C) 85
D) 90
E) 94

Answer & Explanation

1. B) 86
Explanation:

Since 10-6 = 4, 15-11 = 4, 18-14 = 4, 30-26 = 4
So answer will be the LCM of these numbers – 4
So 90 – 4
2. Find the smallest number of 4 digits which is exactly divisible by 12, 15, 21 and 30.
A) 1580
B) 1420
C) 1260
D) 1056
E) None of these

Answer & Explanation

1. Find the least number which when divided by 2, 5, 9 and 12 leaves a remainder 3 but leaves no remainder when same number is divided by 11.
A) 281
B) 357
C) 360
D) 363
E) 224
2. D) 363
3. HCF and LCM of two numbers is 5 and 275 respectively and the sum of these two numbers is 80. Find the sum of the reciprocals of these numbers.
A) 15/242
B) 16/275
C) 32/221
D) 20/268
E) None of these
4. B) 16/275
5. The HCF and LCM of two numbers is 70 and 1050 respectively. If the first number is 210, find the second one.
A) 450
B) 350
C) 510
D) 260
E) None of these
6. B) 350
 WORK & TIME LCM & HCF CI & SI PROFIT & LOSS STD-SPEED & TIME BOAT & STREAM PIPES & CISTRAN PERCENTAGE NUMBER SYSTEM VBODMAS RATIO AVERAGE

 LCM & HCF SET-1 LCM & HCF SET-2 LCM & HCF SET-3 LCM & HCF SET-4 LCM & HCF SET-5