CDS Elementary Mathematics

Question 1

If a train travels 360 km in 4 hours, what is its speed in km/h?

Accepted Answer

90

Answer

Speed = Distance / Time = 360 / 4 = 90 km/h.

Question 2

What is 15% of 240?

Accepted Answer

36

Answer

15% of 240 = (15/100) × 240 = 36.

Question 3

A rectangle has length 12 cm and width 7 cm. What is its area?

Accepted Answer

84 sq cm

Answer

Area of rectangle = length × width = 12 × 7 = 84 sq cm.

Question 4

Simplify: (3/4) ÷ (9/16)

Accepted Answer

4/3

Answer

(3/4) ÷ (9/16) = (3/4) × (16/9) = 48/36 = 4/3.

Question 5

What is the LCM of 12 and 18?

Accepted Answer

36

Answer

The LCM of 12 and 18 is 36, as it is the smallest number divisible by both.

CDS - Combined Defence Services