Question

Which of the following is(are) constant number(s)?

• A. Number of days in a week
• B. Number of seconds in a minute
• C. Number of inches in a foot
• D. Number of days in a year

Answer 1

Answer: (A), (B), (C)

Number of inches in a foot

$\underset{–}{\text{Constant Numbers:}}$
Constant numbers are numbers with fixed value. They do not change upon any situation.

We know:
$\bullet$ A week contains $7$ days.
$\bullet$ A minute comprises of $60$ seconds.
$\bullet$ $12$ inches make a foot.

$\therefore$ The above statements denote a fixed value i.e., these are constants.

$\bullet$ We also know that there are $366$ days in a leap year and $365$ days in a non-leap year.

$\therefore$ Number of days in a year changes with leap year and non-leap year, i.e., number of days in a year is not constant.