number system Model Questions & Answers, Practice Test for ibps rrb po prelims

Answer: (d)

Option (d) is correct.

Answer: (e)

Required quantity of rice

= ${4560 × 7}/30$ kg = 1064 kg

Answer: (a)

$37/13 = 2 + 1/{x + 1/{y + 1/z}}$

⇒ $37/13$ can be expressed as

= $2 + 1/{1 + 2/11} = 2 + 1/{{1 + 1}/{5 + 1/2}}$

Now, this is compared by

$2 + 1/{x + 1/{y + 1/z}} = 2 + 1/{1 + 1/{5 + 1/2}}$

∴ z = 2

Answer: (c)

2 × 3 × 5 × 7 × 11 gives a number that are, divisible by 2, 3, 5, 7 and 11.

So, (2×3 × 5 × 7 × 11 + 1) gives a number that are not divisible by 2, 3, 5, 7 and 11.

Then, that number is not divisible by 4, 6 8, 9, and 10 as well.

Hence, number '(2 × 3 × 5 × 7 × 11 + 1)' is a prime number.

Answer: (e)

Let the three consecutive integers be x, x + 1 and x + 2

According to the question,

x + x + 1 + x + 2 = 39

or, 3x + 3 = 39

or, 3x = 39 - 3 = 36

or, x = $36/3$ = 12

∴ Required largest number = x + 2 = 12 + 2 = 14

Also, from the given alternatives, it could be ascertainal that

12 + 13 + 14 = 39