As the first person is sitting on the chair numbered 3, the sixth person is five places away from the first person.
So, we need to add five places to the chair numbered 3.
∴ Sixth person will sit on the chair numbered 8.

Since, the whole numbers are set of real numbers that do not include negative numbers, -1 is not a whole number.

The whole numbers are set of real numbers that includes zero and all positive counting numbers. Whereas, excludes fractions, negative integers, fractions, and decimals. Hence, 1.29 being a decimal value is not a whole number.

Minimum space needed by Ramya to arrange all the sweets is 90 sq units.
Except for 16×5 the size of all the boxes is 90 sq units.
16×5=80 sq units so she cannot arrange all the sweetsin this box.

We get the predecessor of any number by reducing 1 from that
number. The predecessor of 1 is 0 and 0 lies in the number system of
whole numbers.

Product of any two whole numbers is always a Whole Number.
For eg: If we multiply two numbers say 5 and 7, 5×7=35, 35 is also a whole number.

The sum of any two natural numbers is always greater than any of the addends individually. For example. 4 + 5 = 9, 9is greater than 4 as well as5.