6 tennis balls of diameter 62mm are placed in a cylindrical tube as shown in the figure. Find the volume of the internal unfilled space in the tube and express this as the percentage of the volume of the tube.

What are the differences between similar triangles and congruent triangles?

What are Armstrong numbers?

All real numbers are rational numbers.

A) True

B) False

The L.C.M of the smallest 2 digit composite number and the smallest composite number is:

• (a) 12
• (b) 4
• (c) 20
• (d) 44

Are all natural numbers also whole numbers?