SSC CGL (Prelims) Maths: Arithmetic Operations questions with solutions

Q1. Simplify the following expression: $(3+a)(30)(2-0.2)$

1. 27
2. 63
3. 81
4. 54

Answer: 54

The expression is intended as a simplification problem. Evaluate $2-0.2=1.8$, then multiply by 30 to get 54. The remaining factor is a formatting/OCR artifact, and the correct simplified value among the options is 54.

Q2. The value of 3 + 6 × (5 + 4) ÷ 3 − 7 is:

1. 14
2. 11
3. 12
4. 10

Answer: 14

Using BODMAS, first evaluate the bracket: 5 + 4 = 9. Then 6 × 9 ÷ 3 = 18, and finally 3 + 18 − 7 = 14.

Q3. Simplify: \((18 + 6) \div 3 + (5 \times 2)\)

1. 16
2. 14
3. 18
4. 20

Answer: 18

Use BODMAS: first evaluate the brackets, then division and multiplication, and finally addition. \((18+6)=24\), so \(24\div 3=8\); also \(5\times 2=10\). Adding them gives \(8+10=18\).

Q4. Calculate: \(4^2 + 3 \times 5 - 7\)

1. 24
2. 22
3. 23
4. 21

Answer: 24

Using order of operations, compute \(4^2=16\) and \(3\times 5=15\). Then \(16+15-7=24\).