1000+ SBI Aptitude Questions and Answers Pdf - 1

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Question: 1

The average of 7 numbers is 5. If the average of first six of these numbers is 4, the seventh number is

(A) 11

(B) 12

(D) 15

View Answer

Ans: A

Sum of seven numbers = 7 × 5 = 35

Sum of first six numbers = 6 × 4 = 24

∴ the seventh number = 35 - 24 = 11.

Question: 2

The average age of 20 boys in the class is 15.6 years. Five new boys join and the new average becomes 15.56 years. What was the average age of the five new boys?

(A) 15.2

(B) 15.3

(D) 15.25

View Answer

Ans: C

Average age of the five new boys

= (25 × 15.56 - 20 × 15.6) ÷ 5 = 15.4 years.

Question: 3

The average of 50 numbers is 38. If two numbers namely 45 and 55 are discarded. What is the average of the remaining numbers?

(A) 36.5

(B) 37.5

(D) 39.5

View Answer

Ans: B

Sum total of 50 numbers = 50 × 38 = 1900

Sum total of the remaining 48 numbers = 1900 – (45 + 55) = 1800

∴ Average = $${1800} / {48}$$ = 37.5

Question: 4

The average marks of a student obtained in Physics, Chemistry and Biology is 70. If the student obtained 90 marks in Mathematics, then the new average is

(A) 70

(B) 75

(D) 80

View Answer

Ans: B

Average marks in Physics, Chemistry and Biology = 70

Marks obtained in Maths = 90

∴ New average for the 4 subjects = $${70 × 3 + 90 × 1} / {4}$$ = $${300} / {4}$$ = 75 marks.

Question: 5

Average of ten numbers is calculated. If each number was increased by 12%, then the average

(A) increased by 12%

(B) may increase

(D) will remain unchanged

View Answer

Ans: A

Since all numbers were increased by 12%, the average will also increase by 12%.

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1000+ SBI Aptitude Questions and Answers Pdf - 1

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