numerical symbolic operations Model Questions & Answers, Practice Test for ssc cgl tier 1

Question :21

Out of 38 families in a housing society 5 subscribe to Hindi newspapers alone, 12 subscribe to both Hindi and Marathi newspapers. Find the number of Marathi newspaper subscribers.

Answer: (e)

38 = 5 + n(B) – 12

Number of people who take Marathi Newspaper = 12 + 21 = 33

∴ m(B) = 38 + 12 – 5 = 45

45 subscribe to marathi newspaper 45 – 12 (both)

= 33 subscribe only for Marathi newspaper.

Question :22

If '#' means '+', '★' means '÷', '@' means '×' and '$' means '–' then what will be the value of the following expression?
‘40 $ 20 @ 2 # 40 ★ 20 # 38’

Answer: (b)

40 $ 20 @ 2 # 40 ★ 20 # 38

40 - 20 × 2 + 40 ÷ 20 + 38

= 40 – 20 × 2 + ${40}/{20}$ + 38

= 40 – 40 + 2 + 38

Question :23

If '+' means '×', '×' means '-', '÷' means '+' and '-' means '÷', then what will be the value of the following expression?
288 - 32 + 6 × 45 ÷ 9 = ?

Answer: (d)

? = 288 ÷ 32 × 6 - 45 + 9

or ? = 9 × 6 - 45 + 9

or ? = 54 - 45 + 9 = 18

Question :24

If ‘P’ means ‘divided by’ , ‘R’ means ‘multiplied by’, ‘T’ means ‘added to’ and ‘W’ means ‘subtracted from’,
then 60 T 48 P 8 W 6 R 9 = ?

Answer: (a)

60 T 48 P 8 W 6 R 9 = ?

⇒ 60 + 48 ÷ 8 – 6 × 9 = ?

⇒ 60 + 6 – 54 = ?

⇒ 12 = ?

Question :25

'A ▢ B' means 'A' is multiplied by 'B', 'A • B' means 'A is divided by B', 'A ? B' means 'B is added to A' and 'A = B' means, 'B is subtracted from A' then what will be the value of the following expression?
'10 ▢ 10 = 5 ▢ 10 ? 50 • 10'

Answer: (e)

10 ▢ 10 = 5 ▢ 10 ? 50 • 10

= 10 × 10 - 5 × 10 +50 ÷ 10

10 × 10 - 5 × 10 + ${50}/{10}$

= 100 – 50 + 5

=55

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