averages Model Questions & Answers, Practice Test for ssc cgl tier 1

Answer: (a)

Total annual rainfall = 2.7 × 12 = 32.4 inches

Rainfall for first seven months = (2.7 – 1.1) × 7 = 11.2

Total for first 11 months = 11.2 + 20.8 = 32 inches

Rainfall for last month = 32.4 – 32 = 0.4 inches

14-17. You have to take between 25th and 30th to mean that both these dates are also included.

Answer: (d)

Required average

= ${178 + 863 + 441 + 626 + 205 + 349 + 462 + 820}/8$

= $3944/8$ = 493

Answer: (e)

Let the first number be = 6x

∴ Second number = 3x

and the third number = 2x

According to the question,

6x + 3x + 2x = 154 × 3

or, 11x = 154 × 3

∴ $x = {154 × 3}/11 = 42$

∴ Required difference = 6x – 2x = 4x = 4 × 42 = 168

Answer: (a)

Let the average of 5 innings = x

Scores in sixth inning = 80

∴ Total of 5 innings = 5x

According to the question,

${5x + 80}/6 = x + 5$

⇒ 5x + 80 = 6x + 30

⇒ x = 80 – 30 = 50

∴ His average after six innings = 50 + 5 = 55

Answer: (d)

Let the mother's age be y years.

∴ The age of father = (y + 9) years

The age of son = $y/2$ years

The age of daughter = $(y/2 - 7)$ years

Now according to the given condition,

(y + 9) = 3$(y/2 - 7)$

⇒ y + 9 = ${3y - 42}/2$

⇒ 2y + 18 = 3y – 42

⇒ y = 60 years