Average Aptitude Mcq Pdf Model Questions & Answers, Practice Test for ibps po mains 2024 2025

Question :11

Average of 11 numbers is 7. If every number is doubled, then what will be the new average of the numbers?

Answer: (b)

According to question

${n_1 + n_2 + ... + n_11}/11 = 7$ (Given)

Multiple both sides by 2

${2n_1 + 2n_2 + ... + 2n_11}/11 = 14$

∴ The new average = 14

Question :12

There are 459 students in a hostel. If the number of students increased by 36, the expenses of the mess increased by Rs .81 Per day while the average expenditure per head reduced by Find the original expenditure of the mess?

Answer: (e)

Total expenditure = 459x

36 students joined then total expenditure = 459x + 81

average = 459x + 81/495 = x-1

x = 16

original expenditure = 16 × 459 = 7344

Question :13

In a family of 6 members, the average age of the family at present is 25 while the age of the youngest member in the family is 5yrs, so what will be the average age of the family at the time of his birth ?

Answer: (b)

sum of ages = 25 × 6 = 150

At the time of birth, i.e 5 years back,

so (150-6 × 5)/5 = 24

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