An elevator was at ${12}^{\mathrm{th}}$ floor of a building which has three floors below the basement. If the elevator descends $7$ floors twice and ascends $5$ floors thrice and reaches top $3^{\mathrm{rd}}$ floor of the building, then number of floors in the building is

Study the statements given below carefully

(i) The successor of $0\times \left(-52\right)$ is $1\times \left(-52\right)$

(ii) Integers are closed under division

(iii) $\left(-20\right)\times \left(5-3\right)=\left(-20\right)\times \left(-2\right)$

(iv) $\left(-2\right)+\left(-9\right)$ is less than $\left(-9\right)-\left(-2\right)$

Which of the following is correct?

In my account book, I write positive numbers for profits and negative numbers for losses that I make in my businees. Following are the entries in the book for the last seven days: $21,-19,11,-20,17,25,-13$. How much profit did I make in the last week?

Simplify $\left[15÷3+10\left\{60-8÷4+3\left(5 \mathrm{of}\left(3-7\right)\right)\right\}\right]$

Which of the following statement is correct?

The temperature (in $°C$) difference between Gangtok and Shillong is _____ the temperature difference between Shillong and Mumbai

Which of the following options is not true with respect to given number line?

Which of the following number sentences best describes the problem shown on the number line?