গণিত

1. The least number which is a perfect square and is divisible by each of the numbers 16, 20 and 24, is :

a. 1600

b. 3600

c. 6400

d. 14400

2. How many pieces of 85 cm length can be cut from a rod 42.5 meters long?

a. 30

b. 40

c. 60

d. None of these

3. The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y?

a. 5

b. 10

c. 20

d. 30

4. What decimal of an hour is a second?

a. 0.0025

b. 0.0256

c. 0.00027

d. 0.000126