number system Model Questions & Answers, Practice Test for ibps rrb po prelims
Which of the following numbers is a prime?
Answer: (d)
667, 861, 481 is divided by 23, 21, 13 respectively.
But 331 is not divisible by any other numbers so 331 is a prime number.
If an amount of Rs. 13,957 is divided equally among 45 people, how much approximate amount will each person get?
Answer: (d)
amount received by each person
= $13957/45$ = Rs. 310.15 ≅ Rs.310
How many rational numbers are there between 1 and 1000?
Answer: (d)
There are an infinite of rational numbers between any two given numbers.
One dividing 4996 by a certain number, the quotient is 62 and the remainder is 36. What is the divisor?
Answer: (c)
Let the divisor be x.
So, Divided = Quotient × Divisor + Remainder
Dividend = 4996
Quotient = 62 and remainder = 36
∴ 4996 = 62 × x + 36
⇒ 62x = 4996 - 36
⇒ x = $4960/62$ = 80
The ratio of two numbers is 3 : 4 and their HCF is 5. Their LCM is:
Answer: (b)
If the numbers be 3x and 4x, then
HCF = x = 5
∴ Number = 15 and 20
∴ LCM = 12x = 12 × 5 = 60
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