Explanation

Since you are 5th in a queue starting from either end  so there are 2 persons to your left and 2 to your right

∴∴ Total number of persons are

5+2+2= 9

Explanation

-9×-9=81

So B is correct

Explanation

Fractions with the same denominator are called like fractions.

Example:½, 3/2, 5/2, 7 /2 etc

Sh5-9-2023

Explanation

To round off 87.321756 to 5 significant figures, we look at the 6th significant figure, which is 6.

Since it's greater than 5, we round up the 5th significant figure.

87.321756 becomes 87.322

Explanation

1 milligram (mg) = 10⁻⁶ kilograms (kg)

So, 20 milligrams equals:

20 mg = 20 × 10⁻⁶ kg

Which simplifies to:

2 × 10⁻⁵ kg

Explanation

Find the least common multiple (LCM) of 10, 11, and 17.

The LCM of 10, 11, and 17 is the smallest number that is a multiple of all three numbers.

Calculate the LCM.

The prime factorization of the numbers is:

10 = 2 × 5

11 = 11

17 = 17

The LCM is the product of the highest powers of all prime factors: LCM = 2 × 5 × 11 × 17 = 1870.

Explanation

To find the common factors, let's list the factors of each number:

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

Factors of 45: 1, 3, 5, 9, 15, 45

Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54

The common factors are 1 and 3.

Explanation

The square root of 256 is 16, which has 2 digits.

Counting the digits in 16 confirms that the answer is 2.

Explanation

If the sum of all digits of a number is divisible by 3, then the number itself is divisible by 3.

This is a divisibility rule for 3.

Explanation

Every real number is either a rational or irrational number: True. A real number can either be expressed as a fraction (rational) or cannot (irrational).

Every whole number is a natural number: False. Whole numbers include 0, but natural numbers start from 1. Therefore, 0 is a whole number but not a natural number.

All natural numbers are integers: True. Natural numbers are a subset of integers.

All integers are rational numbers: True. Every integer can be written as a fraction (e.g., 

5 = 5/1), so all integers are rational.