average Model Questions & Answers, Practice Test for ibps clerk mains

Answer: (e)

Required average

= ${118 + 186 + 138 + 204 + 175 + 229}/6$

= $1050/6$ = 175

Answer: (a)

Average score

= $1/6 [221 + 231 + 441 + 359 + 665 + 525]$

= $1/6 [2442]$ = 407

Answer: (b)

${x + x + 2 + x + 4 + x + 6}/4 = 9$

4x + 12 = 9 × 4 = 36

4x = 24

$x = 24/4 = 6$

Largest number = x + 6

= 6 + 6 = 12

Answer: (c)

21a + 21b = 1134

or, 21 (a + b) = 1134

a + b = $1134/21 = 54$

∴ Required average = ${a + b}/2 = 54/2 = 27$

Answer: (d)

The total age of the family at the birth of first child = 18 × 3 = 54

While the total age of the couple at marriage = 25 × 2 = 50.

⇒ The years from marriage till the first child's birth

= ${54 – 50}/2$ = 2 years.

The total age of family at the birth of the second child. = 15 × 4 = 60 years.

⇒ Second child was born

= ${60 – 54}/3$ = 2 years after the first.

Similarly the twins were born

= ${(12 × 6) - 60}/4$ = 3 years.

After the second child and today the twins are 4 years old.

(∵ average age of the family became 16 years from 12 years)

∴ Age of eldest son = 4 + 3 + 2 = 9 years.