CDS Elementary Mathematics 3

Question 1

Two pipes can fill a tank in 10 and 15 hours respectively. How long will they take together?

Accepted Answer

6 hours

Answer

8 hours

Answer

5 hours

Answer

12 hours

Question 2

If the ratio of two numbers is 3:5 and their sum is 96, what is the larger number?

Accepted Answer

60

Answer

36

Answer

48

Answer

56

Question 3

A man walks 4 km north and then 3 km east. How far is he from his starting point?

Accepted Answer

5 km

Answer

7 km

Answer

4 km

Answer

6 km

Question 4

What is the compound interest on $1000 at 10% per annum for 2 years?

Accepted Answer

$210

Answer

$200

Answer

$220

Answer

$100

Question 5

Solve: 3(2x − 4) = 18

Accepted Answer

x = 5

Answer

x = 4

Answer

x = 6

Answer

x = 3

Question 6

How many prime numbers lie between 1 and 20?

Accepted Answer

8

Answer

7

Answer

9

Answer

6