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Information and Communication Technology MCQ - Number System

26 Find the unit digit in the product 268 x 732.

Unit digit in 268 x 732 = Unit digit in 8 x 2 = Unit digit in 16 = 6

27 Find the value of 200x439+200x321 in standard form is

200x439+200x321=200x760=152000=1.52x10⁵

28 Find the sum of first 21 odd numbers.

Sum of first n odd numbers is = n²
:. Required sum = 21² = 441

29 If sum of six consecutive odd numbers is 168, then find the largest of these numbers

Let the odd number be 2 x+ 1

Then, 1(2 x-5)+ (2 x- 3)+ (2 x-l) +(2 x+ 1)+(2 x+3)+(2 x+5)=168

=> 12x = 168 =>x = 14
:. Largest is 2 x+5 = 28+5 = 33

30 Find the sum,of all prime numbers
less than 20.

2+ 3+5+7+ 11+ 13+ 17+ 19=77

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Question:

Afraction is equivalent to 5/8 Its denominator and numerator add upto 9L What is the difference between the denominator and numerator of this fraction?

A. 19
B. 21
C. 3
D. 13

Correct answer: B

Explanation:

Let the fraction be 5x/7y Now, sum of numerator and denominator = 91 i.e 5x + 8y = 91 => 13x = 91 => x = 7 ∴…

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