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

Question :11

The following equation is incorrect. Which two signs should be interchanged to correct the equation? 14 – 6 × 30 ÷ 10 + 4 = 28

Answer: (c)

The given equation,

14 – 6 × 30 ÷ 10 + 4 = 28

After changing signs – and + we get,

14 + 6 × 30 ÷ 10 - 4 = 28

14 + 6 × 3 - 4 = 28

14 + 18 - 4 = 28

32 - 4 = 28

28 = 28

Question :12

After interchanging + & × and 12 &18, which of the following equations will hold true?

Answer: (d)

If + → × ,× → +, 18 → 12, 12 →18

(18 + 6) × 12 = 90

(12 × 6) + 18 = 90

(72 + 18) = 90

90 = 90

Question :13

If "+" means "minus", "×" means "divided by", "÷" means "plus" and "–" means "multiplied by", then 108 × 12 + 3 – 6 ÷ 4 = ?

Answer: (a)

+ → –, × → ÷, ÷ → +, - → ×

Then, 108 × 12 + 3 – 6 ÷ 4

= 108 ÷ 12 – 3 × 6 + 4

= 9 – 3 × 6 + 4

= 9 – 18 + 4

= – 18 + 13 = – 5

Question :14

If "A" means "plus", "B" means "divide", "C" means "multiply" and "D" means "minus", then 162 B 27 C 5A 8 D 35 ?

Answer: (d)

A → +, B → ÷, C → ×, D → –

A 162 B 27 C 5 A 8 D 35

=162 ÷ 27 × 5 + 8 – 35

= 6 × 5 + 8 – 35

= 30 + 8 –35 = 38 –35 = 3

Question :15

If "S" denotes "multiplied by", "V" denotes "subracted from", "M" denotes "added to" and "L" denotes "divided by", then 96 L 8 S 4 V 16 M 9 = ?

Answer: (b)

S → ×, V → -, M → +, L → ÷

96 L 8 S 4 V 16 M 9

= 96 ÷ 8 × 4 – 16 + 9

= 12 × 4 – 16 + 9

= 48 – 16 + 9

= 57 – 16 = 41

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