Number System & Average MCQs for LDC
Practice 20 free Number System & Average questions under Arithmetic — Maths.
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LDC — Arithmetic — Number System & Average
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
A batsman scores 87 runs in his 17th inning, thereby increasing his average by 3. What is his current average after the 17th inning?
Question 2 of 20
While evaluating the expression [(8 - 5) ÷ {(4 - 2) + (2 + 8/13)}], what is the exact intermediate numerical value of the entire denominator component encapsulated within the curly braces?
Question 3 of 20
The sum of two numbers is 20 and their difference is 4. Find the product of the two numbers.
Question 4 of 20
The average age of 10 persons increases by 2 years when a person aged 25 years is replaced by a new person. What is the age of the new person?
Question 5 of 20
The average of 50 numbers is calculated as 40. Later it was found that one number 45 was wrongly read as 20. What is the correct average?
Question 6 of 20
The average age of 10 men increases by 2 years when a 20-year-old man is replaced by a new man. What is the age of the new man?
Question 7 of 20
Find the largest 4-digit number exactly divisible by 12, 15, and 18.
Question 8 of 20
A number when divided by 899 leaves a remainder of 63. What will be the remainder when the same number is divided by 29?
Question 9 of 20
The average of 11 numbers is 50. If the average of the first 6 numbers is 49 and that of the last 6 is 52, find the 6th number.
Question 10 of 20
A can do a piece of work in 10 days and B in 15 days. They work together for 4 days. What fraction of the work is left?
Question 11 of 20
The average age of 8 men increases by 2 years when a new person replaces a 20-year-old man. What is the age of the new person?
Question 12 of 20
If the numerator of a fraction is increased by 20% and its denominator is increased by 25%, the new fraction becomes 3/5. What was the original fraction?
Question 13 of 20
What is the unit digit of 3^45?
Question 14 of 20
A batsman scores 100 runs in his 11th innings, thereby increasing his average by 5. What is his new average?
Question 15 of 20
What is the unit digit in the product (3^65 × 6^59 × 7^71)?
Question 16 of 20
What is the value of 0.6̅ + 0.3̅ ?
Question 17 of 20
The mean of 100 observations was calculated as 49. It was later discovered that three observations taken as 40, 20, 50 were actually 60, 70, 80 respectively. What is the correct mean?
Question 18 of 20
The average age of a class of 30 boys is 15 years. If the teacher's age is included, the average age increases by 1 year. What is the age of the teacher?
Question 19 of 20
The mean of 100 observations was calculated as 49. It was later discovered that three observations taken as 40, 20, 50 were actually 60, 70, 80 respectively. The correct mean is:
Question 20 of 20