RRB Junior Engineer (JE) Sample Paper: Mathematics-26

1. The HCF of two numbers is 8. Which one of the following can never be their LCM?

(a) 32
(b) 24
(c) 48
(d) 60

2. The product of the LCM and HCF of two numbers is 24. The difference of the two numbers is 2. Find the numbers.

(a) 2 and 6
(b) 9 and 14
(c) 2 and 4
(d) 6 and 4

3. Find the greatest number that will divide 640, 710 and 1526 so as to leave 11, 7, 9 as remainders respectively.

(a) 36
(b) 37
(c) 42
(d) 29

4. If LCM of two natural numbers is 36 and their sum is 30. Find the two numbers.

(a) 15, 4
(b) 12, 18
(c) 9, 21
(d) 4, 26

5. Two persons A and B walk round a circle whose diameter is 1.4 km. A walks at a speed of 165 metres per minute while B walks at a speed of 110 metres per minute. If they both start at the same time, from the same point and walk in the same direction, at what interval of time would they both be at the same starting point again?

(a) 3h
(b) 4/3h
(c) 5/3h
(d) 7/2h

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1(d), 2(d), 3(b), 4(b), 5(b)`