RRB Junior Engineer (JE) Sample Paper: Mathematics-31

1. The LCM of three numbers is 4752 and HCF is 6. If the two numbers are 48 and 66, then find the third number.

(a) 54
(b) 72
(c) 48
(d) 528

2. How many numbers between 200 and 300 which are exactly divisible by 6, 8, and 9 ?

(a) one
(b) two
(c) three
(d) four

3. There are two electrical wires, one is 9 m 60 cm long aluminium wire and the other is 5 m 12 cm long copper wire. Find the maximum length that can be equally cut from each wire in such a way that the total length of each wire is exactly divisible by it.

(a) 40 m
(b) 46 cm
(c) 64 cm
(d) 60 m

4. Find the least number of girls, so that they can be arranged in the groups of 15 or 20 or 30.

(a) 60
(b) 90
(c) 45
(d) 80

5. Find the least perfect square number which is exactly divisible by 3, 4, 5, 6 and 8.

(a) 3600
(b) 3900
(c) 3500
(d) 3200

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1(b), 2(b), 3(c), 4(a), 5(a)`